Glad you guys like it.

The greatest tip I can give is to get Photoshop. I currently have PS7, though I hear CS is very good too.
Most of the tricks are simple enough. Getting rid of the display stand was easy--you simply take samples of the nearby wall using the CLONE-STAMP feature, then paint on top of the stand. The table isn't as easy as the wall, though. I brushed over the base in different colors sampled from the table and blurred it. Then I added lighter colored dots (like a starfield) onto the part I painted. (this is all on a separate layer) After that, I hilighted the section and selected [filter] in the top menu, [blur], then [motion blur]. You can directionalize the blur of the selection as well as the intensity. That helped to create a matching grain to the existing grain on the table.
Of course, I slightly cheated on that. To blend it together better I ran a blur tool across the table top.
As for the motion blur on Mirage, same trick. This time, I simply 'copied' a cut-out sample of blur onto another layer. I used the motion blur to streak it the direction I wanted, then moved the layer around until the positioning looked right. The last step I did was to reduce the transparency of the layer (Opacity selection in the layers toolbox display) to my liking.
Laser and sparking effects are also done on another layer. When opening a new layer, change the setting from NORMAL to SCREEN. It automatically brightens the colors, making it easier to create bright lights, fires, or whatever is needed.
The rest is simply a matter of practice. I'm not utilizing PS anywhere NEAR to its capacity, but it still is a great tool.