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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.
Can we finally get some affordable 10GbE switches too?
Right?! Most affordable 10G switches are SFP+ which requires a lot more research to make sure you get the right modules and cabling.
Just use DACs within the rack. Single mode fiber patches and SFP+ optics are also cheap and easy to find.
Always amazes me how few people seem to know about DACs. I use them extensively in racks. They're inexpensive and easy to use.