I recently launched my Robot kit Logitraxx on Kickstarter. Its basically Tamiya type tracked vehicle equipped with Spartan 6 FPGA, onboard USB to JTAG, and plenty of I/O and sensors. If you are looking to learn basic VHDL for FPGAs aimed exclusively at robotics, this is the perfect platform. I'll be providing detailed step-by-step basic VHDL in the Xilinx ISE toolsuites as well. Check out the Kickstarter here...