Hey, I am using my Seidio 8700 Desktop Cradle with my 8800 and it fits PERFECTLY (great cradle too).
I like that the charger is always attached to the side of the cradle, no fishing around to find it on the floor (amidst my 12 other chargers.. <g>)
There have been a few reviews that the BB 8700 didn't fit really tight in the cradle from Seidio, but I haven't found that to be the issue at all. My 8700 has the fat Seidio batter and fit nicely. My 8800 fits just as tightly (if not more so).
Link: SEIDIO'S RIM BLACKBERRY USB DESKTOP CRADLE - *BD2-CRDSIBBX1-BK