I use the free version of Pic Resizer, resize up to 5 photos.Easy to select images from stand-alone app or images viewer (Gallery). There's a paid version with more options.
There's a new app I made that makes an email-sized copy (800px long-edge) of each regular shot you taken, puts em in a separate folder on the sdcard..
It's geared towards being a photo emailer though, the point was trying to make that one task as easy as I could imagine..
If it's of interest to anyone to take a look at, constructive criticism appreciated..