Ya, i'm really thinking of picking one up. I used digilent's boards when i was in college and was lucky enough to have the founders of the company as profs for a few of my classes. I'll have to see if i can find their board in my old stuff. As for their use, I remember them being a good platform to work on, although the software for the xilinx chip was somewhat finiky at times. Although that very well may have been user error
. I've only used their logic boards, but I was really excited to see the AVR based controller board.
After posting this i noticed they had what seemed like a nice intro robot kit. Just the foundation and such. Although the $79 they want for it seems kinda on the steep side.
http://www.digilentinc.com/Products/Catalog.cfm?Nav1=Products&Nav2=Mechatronics&Cat=Robotics . They also have a second edition of the CEREBOT board which supports the ATMega64L instead of the ATMega64.
http://www.digilentinc.com/Products/Detail.cfm?Prod=CEREBOT-II&Nav1=Products&Nav2=Embedded. As always, Happy Building