Requirements: Latest IEView (22.214.171.124), TabSRMM (0.9.9.92), Miranda
It looks like Longhorn. The archive includes a "glass" or "aero" style (longhorn_glass.ivt, shown above as well) which looks nice as well as a regular black longhorn style. There is more than one background included (as shown above). To change the background, read the readme :).
The font, Segoe UI, is used for the Longhorn template. So you'll need it installed. You can get it from here: http://chunk.3rror.com/files/segoeui.zip
Any bugs/suggestions/whatever post them here. If you have questions, consult the readme first, then ask me/Hidea.
Screenshot here: http://chunk.3rror.com/files/lhfinal1.png