Squash bug eggs? Hard to tell from pic... since on tomatoes, maybe stink bug eggs? In both cases, those are bad. If the eggs had little projections around them, then maybe spined soldier bug, which is a good bug (predator.)

They look like stink bug eggs to me. I get them all the time on my summer squash, and occaisionally find similar from their cousin the leaf footed stink bug on my tomatoes. Most of the time they are laid as in your picture, on the upper surface of a leaf in a cluster. Most other insects lay on the underside of a leaf. I have caught a sphinx moth (tomato hornworm adult) laying eggs on a tomato stem.

Here's a direct link to your picture.

It is difficult to tell from the photo but they might be ladybug eggs. They appear to be more bullet shaped than flat and standing upright rather than laying flat and if so then is there pedicle attachment to the leaf? If yes then ladybugs. ;)

Compare these photos to yours.

Both squash bug eggs and leaffooted bug's eggs are laid flat on the underside of the leaf.

Dave

Here is a link that might be useful:

Digdirt, those are all on the bottoms of the leaves in the pics... mine are all on top. There's no pedicle that I can see, mostly flat or at least horizontal. I'm thinking that its probably the stink bugs mentioned. THanks for all your help!

Maybe it depends on the circumstances, but I find the far majority of my squash/stink bug eggs on the top surface of my yellow squash leaves.

Well, they're all gone now, so they must have hatched! ICK!