I recently worked on the following RC bugs:

• #696187 — squid-cgi: CVE-2012-5643: cachemgr.cgi denial of service
  NMUed the upstream patches after nearly 2 months of no maintainer reaction on the bugreport.
• #684645 — sendmail-bin: Order of fcntl and dotlock in maillock
  Coordinated with the soon-to-be maintainer and explained (in private) that the upload should only contain a minimum amount of changes in order to be unblocked.
• #690075 — unblock: dnsmasq/2.63-4
  Pinged the maintainer about the current situation.
• #693208 — clang: unable to link trivial test program on armhf
  Reproduced the issue, now building clang on qemu-armhf… This takes quite a while.

It is getting hard to find RC bugs to work on. If you have access to ia64 hardware, have a look at #694971 — Epiphany browser crashes within JSC::JSArray::increaseVectorLength() or #697172 — sporadic crashes of epiphany browser due to a thread-unsafe favicon database. Both have patches available that just need to be tested.