any linux OSs I can put on a 4gb sd card?

[glitch]

I figured out how to boot from a card-reader + a 4gb SD card. So now I just wanted to mess around with something that I can put on the SD and boot from that and see how it goes. Suggestions?

[cdnLilWolf]

In theory. yes. DSL (Damn Small Linux) is only 50MB. OpenSuse 10.2 and Fedora easily fit on a DVD. Knoppix Live CD fits on a ... well a 700MB CD.

As you can see, size is not the issue. I am not really sure about support for card interfaces out of the box (as it were). I've only barely skimmed such messages on the Linux forums I watch as I don't use the feature. You may need to install support for SD cards after the fact.