[gh02t]

The Lattice boards mentioned above are a good start. Really they're your only choice since they're the only open source toolchain, but the iCEStick is a pretty good place to start. It's a decent FPGA in a USB stick form factor and it's self contained so you don't need an external programmer. At $25 it won't break the bank.

If you meant more how to get involved with the community effort, I'd start with Clifford Wolf's page (http://www.clifford.at/icestorm/ ). He's the main guy behind the efforts with the iCE40 toolchain and his page links to some other efforts to reverse engineer Xilinx and Altera chips. There's a lot of interest in more open FPGAs, but I think there's a lack of skilled people so you'd likely be welcome.