DNA sequencing tends to get done by core facilities at most institutions, but if you're in the New York/New Jersey area and you need sequencing done, you couldn't do better than Genewiz. You give them miniprep quality DNA and they give you sequence. Results are emailed to you quickly and even on Saturdays. So now your boss can legitimately call you on Saturday and ask about those clones. Oh joy!

They have two speeds, fast and faster:
"Standard Service - Data reported within one business day after samples are delivered to GENEWIZ.
Same Day Service - Data reported by 5pm EST the same day samples are delivered to GENEWIZ (by 10 am EST). Up to 94 samples per order, in most cases an additional charge applies."

I try not to pimp too many companies associated with my work, but these guys really do rock. When I was asking around for recommendations for a company to do sequencing, theirs was the only name that came up.