I second the upduino, it's a great board. Recently i have been using the iCESugar-pro which is also supported by the open source toolchain, and comes in a handy

I second the upduino, it's a great board. Recently i have been using the iCESugar-pro which is also supported by the open source toolchain, and comes in a handy SODIMM form factor that makes it easy to incorporate into real projects. It uses the lattice LFE5U-25F-6BG256C with 24k LUTs and 32 MB SDRAM, 106 usable i/o connections, about $60.