I've been pretty dismissive of the $40 (new) Promaster 100-300mm f/5-6.3 I bought a couple of months back. On a whim I took it out the other afternoon, and I must say I was pleasantly surprised with the results I got. This shot was taken wide open @ ISO 400:
I guess pretty much any lens can give a decent result in the right light, with the right composition, eh? Oh, and a little RAW adjustment, a little Levels, a little unsharp mask...
I know this isn't in the "Post Your Photos" forum, but who else has good pictures from crappy lenses to share?