@jhocking: I exactly understand, what Kinji means. If you use PCX or BMP sprites, it's important to not having dark borders.

The only problem with TGA sprites is, that, for example, instead of two sprites for a simple X for a plant you need 4 TGA sprites, each with the half image of the plant - otherwise you have visibility problems. And with a lot of TGA sprites the frame rate goes down. But TGA really looks much better, if you go nearby.

So I use both, PCX and TGA sprites.
Willi