After installing Win7 RC on my production Media Center box (ie the box I literally can't watch TV without) I noticed an annoying problem.

The skip forward & back buttons didn't work!

At first I feared the issue was an intended "by design" change.  After all, I'm sure the commercial TV networks don't like us skipping over their ads.  Fortunately, it seems it's a compatibility issue between Win7 RC and my IR receiver (in case, Zalman HD160, IRTrans).

The solution:

Map the IR codes to the keyboard equivalents for the skip buttons via the following changes in %ProgramFiles%\IRTrans\remotes\apps.cfg.

[APP]MEDIACENTER

NEXT [KEY]\CTRLF
PREV [KEY]\CTRLB