One thing I've been doing on sabbatical is to take the time to find improved solutions to common tasks I encounter. For example, I use vim (VIsual editor, iMproved) to edit text, and I've been taking the time to read the help pages to learn even more tricks. I'm finding it's definitely worth reading the help pages, even if you know a program well. On the horizon: working with svn and python.
Read and responded to Laura Chajet's latest research draft.
Gave some tips to Ali Rafiee about figuring out problematic catalog entries.
Sent comments to Yue Shen on the DR7 quasar properties catalog draft.
Lots of miscellaneous email and bookmark clearing-up.
Colloquium by Seb Oliver on HerMES (Herschel Multi-tiered Extragalactic Survey).
Started reading reverberation mapping paper for next week's journal club. And finished at 1 AM, about two hours later than I thought it was.