All I really care about is them being very consistent with how they indicate YC in the title (so it can be searched for); always YC S11 not YC11 or YCS11 or YC Summer 2011 or S11 or whatever.

At some point, having actual tags per-submission could be cool too. Sort of a stopgap on the way toward Reddit-style subreddits. Tag posts with admin, security, python, vc, ...