I know I must not be the only one who thinks we should already have cheap 10G (not just 2.5G and even 5G) BaseT infrastructure.
I was just talking with @jeffpc about how in a perfect world someone would make a cheap equivalent of Intel's X55x series of NICs. 1/2.5/5/10GBaseT, existing drivers, and a path since the low-end switch vendors don't seem to have aggressively priced >GigE switching HW.
I might be missing latest state-of-the-market, but last time I checked was last year this month.