I have some weekday-specific TODO-items; I use a diary-sexp to specify the days:
** TODO do this every day SCHEDULED: <%%(memq (calendar-day-of-week date) '(1 2 3 4 5))>
However, understandably, org (using 6.21b) does not seem to recognize this as
a *recurring* appointment, so when I mark it as 'DONE', the whole things is marked as CLOSED and things don't appear in my agenda anymore.
Now, I could work around it by: a) make five 'normal' recurring entries for each weekday
b) don't use TODO, but just leave the item but that is not really nice...