I use relatively little plugins, EQ and limiting, mostly.
The Sonoris EQ's (SMEQ and Parallel EQ) look cool, I need to order them.. Actually I might just order them right now.
Voxengo Elephant has been my to-go limiter for a good while. But the new version is now too damned complicated for my taste! It sounds better than ever, but all the tweakability puts me off a little.
DomC's recommendation on the Fabfilter Pro-L is right on. Much simpler, and seems to match the way I usually "handle" transients prior digital limiting. Pro-L might become my new to-go limiter, and it also seems to complement the Elephant well.
Other plugins, although not the latest: Spitfish gets regular use here, I just like it. GClip from time to time.
That's about it, really.