Training budget for confs/courses/books is a big one for me, it shows that a company is invested in you and helping you further your career.

Another one is relaxed working hours and having a culture of trust with regards to when you're actually in the office. It shouldn't be a big deal if I need to leave early one day, or if I decide to do reduced hours but work flat out during the time I'm in the office, as long as the work gets done - who cares when?