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a bartik backport is in the works and there's a working mod for D6 in the issue queue here
might wanna reference that on the project page for those who want both themes in D6 ;)
Gimme a holler whenever there's one in CVS (as opposed to just an issue attachment) and I'll be sure to link to it.
See #850624-49: D6 port for Bartik?.
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