best Philly locales for late night work?

any recommendations for good places to do "late night" work (i.e., between 6pm-12am)?

some favorites of mine:

1. Chapterhouse (9th & ~South, open til 8pm, 10pm on Thurs)

2. Char & Stave (Ardmore; not Philly but an awesome cafe/bar, open til 11pm or 12am depending on day)

3. The Board & Brew (University City ~33rd, open til 10pm or 11pm)

4. Haraz (Fishtown Franklin & Girard, open til 10pm or 12am; University City ~34th, open til 10pm or 11pm)

always looking for alternatives to mix things up.