Emacs org-mode, repeat tasks M-F but not weekends?

If you just need a reminder, and don't need to mark them as 'DONE' in your org-file, you could use the calendar integration for these situations.

** Triage Bugzilla Entries 09:00-10:00
   <%%(memq (calendar-day-of-week date) '(1 2 3 4 5))>

This will insert an entry into your daily agenda for weekdays only, but not a task.

Unfortunately, org-mode doesn't seem to support this in a simple command, but you can replicate this by setting up multiple weekly repeats for the same item like so:

* TODO My task
  SCHEDULED: <2015-02-09 Mon ++1w>
  SCHEDULED: <2015-02-10 Tue ++1w>
  SCHEDULED: <2015-02-11 Wed ++1w>
  SCHEDULED: <2015-02-12 Thu ++1w>
  SCHEDULED: <2015-02-13 Fri ++1w>