I have a detailed post and link on page two of the stickied thread about screenshots. It is for Shootme which is no longer in the market anymore but works perfectly on my non rooted bionic. Just follow the instructions and install it. I've had zero luck nor do I like any other screenshot application.
Just downloaded Screenshot It by Edward Kim. Trial version gives you 5 shots to try out program. I inverted the colors. Otherwise works perfectly on the Bionic. Note 60% battery life at almost 9pm (unplugged from charger at 7am this morning and used it moderately throughout day).
Well, I'm too lazy to look at the first page of the Bionic sub-forum and see a thread with a sticky for Bionic screenshots, so let me try the search. Hmmm what kind of phone do i have? a bionic. Hmm what am i interested in? Screenshots. Let me try searching for Bionic Screenshots(see what I did there?) and I get this: