Well, I just finished porting RoboEmu over to Linux/Gtk+. It includes all the functionality of the Windows version, plus it is a little more stable and doesn't have some of the nasty quirks of Windows.
Anyway, to build it, follow the instructions in the file INSTALL after untar/ungziping it. If you need a binary, contact me and I'll see what I can do.
Assuming you people don't find all sorts of errors/problems with it, I'll start working on a PBASIC IDE for Linux this weekend. If all goes well, it should be done by Monday morning...maybe.
As always, it's available at my website:
http://FIRSTprograms.tripod.com/Programs.htm
While you're there, check out gDash, a Gtk+ based dashboard viewer for Linux.
--Rob
P.S. Glade is amazing!