another pic

http://tinypic.com/r/i1ikv8/6

http://tinypic.com/r/2w6cpw8/6

Here is a link that might be useful: bug

What little I can see appears to me to be a slug, a not particullarly usefull critter in the garden except as a food for toads and snakes.
There are a number of ways to control slugs which can be a real problem in a well mulched garden since that does create the conditions, cool and moist, they prefer to live in. Saucers of stale beer, sprinkling iron phosphate (one brand name is Sluggo) around, spraying foliage with cold, caffienated coffee (this has worked for me although there are some that will maintain it does not), encouraging predators (toads and snakes) to hang around.

Here is a link that might be useful: About Slugs

I can't see the critter clearly either. But I suggest a small sucking pest, one with wings.

Sure doesn't look like a slug, to me. Hopefully, we can get fatal to post some improved images.