Has anyone tried to get RoadNav working? It installs successfully, though it feels a bit slow and the fonts aren't right (i.e., some of them are very large). Also, it miscalculates the screen size, so a portion of the configuration dialogs are off-screen.
I have a Holux M1000 GPS receiver. It's Bluetooth, so I haven't been able to get it work with the XO as of yet (I haven't bothered with getting the kernel modules for BT). I did order a data cable for the receiver, so I should be able to get it hooked up via USB in the near future.
I was going to put compiled maps on a SDHC card, but, being an idiot, I managed to pick up one that doesn't work before seeing that note on the OLPC wiki. A map of the surrounding counties takes about 100MB, I believe. I'll go and recompile maps again, once I get one of the approved SDHC cards.