Hi Tina, are you looking for any particular cultivars?
I grow not less than 50 hydrangeas of about 20+ names and could spare cuttings from some of them.

I've had trouble overwintering cuttings - any advice on how to do that? I know they don't fare well in pots above ground, at least.

It seems like it's preferable to start cuttings early in the season, maybe right about now, to give them plenty of time to get established. Ones that survive that first winter do well, it's just getting them over that hurdle that can be a problem.

I have seedlings of oakleaf and H. paniculata 'tardiva' if you (or any other NE forum members) are planning to be on the Cape anytime soon and would like some. That's probably not what you're looking for, tina, they're nothing like mopheads.

"I've had trouble overwintering cuttings - any advice on how to do that? I know they don't fare well in pots above ground, at least."

Nan, in my experience the best/strongest cuttings are from cuttings taken in a Spring from old/hard wood with two live buds buried and one left above the soil level. Semi-soft wood cuttings taken this time of the year will root as well, but will be not as strong as the spring's ones.
In most cases spring cuttings of hardy varieties will be ready to be transplanted in ground in August-September, while summer-taken cuttings need to be overwintered in pots. No big deal either, 1G pots shouldn't take a lot of space in a garage or similarly protected space.
If you have some very rare or hard-to obtain-again seedling you may store it in 'thermos'.
Say you have your rooted seedling in a 1G pot and it's 7-10" tall.
Wait untill plant will be leafless or remove all leaves, wrap your 1G pot (make sure that bottom of the pot wrapped as well) in some old cloth and insert it into 3G pot. Cover with a same size 3G pot upside down (rim to rim) and seal the joint with a masking or duct tape. Seal the bottom hole of the top pot. Done.
When night temps will be decisevely in 20's remove top pot, in 30's remove cloth wrap and bring it to the day light.
I've overwintered several tender 1G babies in such way with 100% rate of success.
Angel's Eye, strictly z7 plant, was 8-10" tall by the end of the last season and happily blooming now,

Thanks, Geo, I'll give that a try. I have several favorites (including Preziosa, my absolute ideal) and one especially unusual one (whose very strange name escapes me at the moment) that I'd love to propagate. My success rate with early summer cuttings has not been very good, maybe 30%.

"...and one especially unusual one (whose very strange name escapes me at the moment)..."

Ayesha aka Popcorn hydrangea?

I think it is Hydrangea involucrata 'Tama Azisai'

These photos are not mine, but they look like mine. I suppose some people would not like this plant, but I do, especially love the buds:

The flowers, not quite open:

Nan, involucratas are rarely seen in common nurseries and ordinary gardens thus practicaly not known to most of the gardeners. As far as I know only 3 to 4 cultivars of it available in US while in Japan they count them in hundreds.
Very unusual plant, indeed and I'm envious since I don't have it in my collection.
Does yours sprawl or is a more or less standard upright plant?

It's quite upright, medium sized.

I have moved it a couple of times, and haven't found just the right spot yet - the first spot became too shady after a few years, now it's too dry and sunny. It is also susceptible to Japanese beetles, which is a problem in my garden especially where this plant is, near some climbing roses. The JBs only seem to like the opening buds, and don't do any visible damage to the foliage as far as I recall.

I bought this more or less by accident when I was catalog shopping for Preziosa - I couldn't pass this one up because the buds looked so interesting.

I'd be happy to take some cuttings for you, if you'd like to try it - do you think it's worth trying softwood cuttings at this point?

Nan, thanks for the kind offer and I'll definitely take you up on it, but I'd prefer to have cuttings in a spring, especialy from marginaly hardy/non-hardy hydrangeas.
I'll remind you next spring.
Count on it! :-)

OK - I think Idabean is hoping to host a spring swap, maybe I could bring them to that. Or this might finally be an excuse to get out to Olivers!

Thank you ego45. I was looking for hydrangeas that are good for growing in containers. I would like to try forever pink or hobella (old wood varieties). I also love the angel's eye from your pic. I also wanted some advice being an amateur at this new obsession. I have a 1.5' tall glowing ember in a container that is 1 yr old this summer but I don't see any buds yet. I love the foliage on this plant but is there anything I can do to make it flower? Thanks once again.

Tina,
re: Growing hydrangeas in containers,
There were several recent threads about container grown hydrangeas on the Hydrangea forum. All basics and particulars of the topic were covered there.
re: cuttings,
Contact me via GW page (click on my profile).

Can anyone direct me to one of the Halo hydrangeas? Plant or cutting is fine. Or another hydrangeas with picotee blossoms? I'm in Z6. Looks like Hines Nurseries developed a Halo series w/picotee blooms; Hines has been into and out of bankruptcy twice. Perhaps they've gone down three times? Saw this in Newport garden and 'twas beautiful. Location can be at nursery outside of CT; I'll drive! Thank you.