Seems CPU makers currently have more transistors than they know what to
do with, so they're adding cores and doing a lot of boring stuff like
SSE2, SSE3, SSE4, etc.
SSE(n) isn't useless since it speeds up stuff like video encoding by,
say, a few times.
For databases, I'd say scatter/gather IO, especially asynchronous
out-of-order read with a list of blocks to read passed to the OS.
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