Comment Intel have done this before... and here's the snag (Score 3, Informative) 80
I'd already been thinking about the possibility of end-user-accessible, on-the-fly-reprogrammable FPGA functionality as part of a "regular" computer before I heard Intel had produced an integrated CPU/FPGA (though it's not clear how easily configurable the FPGA was there). I raised the issue in that previous thread and got a *very* interesting and informative response (thank you Tacvek) that pointed out some major problems with the concept of general access to such functionality.
The issues raised there explain why Intel are unlikely to be making an easily-reconfigurable hybrid product like this available to the general public any time soon, however smart and exciting the idea sounds.