I'd support switching it back as the THEAD tag isn't really adding much here, as it is intended for long tables where you might want the heading to be repeated (on every page of a print out perhaps) and is very poorly supported anyway.
It might make slighly more sense to swap the TD (table data) tag for a TH (table header) tag but it's not essential either.
Themes
css problem (?) in 1.4 beta
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