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Realtek's $10 tiny 10GbE network adapter is coming to motherboards later this year
(www.tomshardware.com)
This is a most excellent place for technology news and articles.
I connect my primary and backup servers on 10G directly via a crossover cable for transferring ZFS snapshots. No actual 10G switches or anything at the moment but if I add any more servers I need to back up I'll probably get a small 10G switch to put in between.