File conversion

Ok, I have a bit of a problem. Long story short I need a way to convert Bitmap images into something els, like PNG and the sort. How the fuck do I go about this?

I'v heard there are programs out there that do this, and I'v gotten some random likes, but I dont understand ANY of it.

So if someone we be so kind as to link me to whatever program is used for doing stuff like this and them tell me how to use it.

Using photoshop to batch convert is a pain. You have to set up actions, and then select a directory. At least in 7.0, you can't select multiple files within a directory, just the directory. Gay.

More importantly, photoshop has fuck awful PNG support. If you use photoshop to convert to PNG, you either need a third-party plugin, or you'll need to use pngcrush or advpng after.