While I know this topic is rather old. . .
I have used MS World Wide Telescope for some things. It merges most images with various databases, and if memory serves me right it will link out to other databases out there. A google search should get you there if your interested in it.
Sloan's Digital Sky Survey is in it. . . As well as Radio surveys, Infrared, Microwave, etc. Some of The Hubble Telescope images are in it to.
The only thing is you have to remember. . . Well the images I've been looking at are very small, so they may not always show up on the digital sky survey, or necessarily in the other surveys either.