I'm looking for office space to rent/lease/borrow on an as-needed basis. For example, two hours here, three hours there. Does anyone know if such a service exists? Like Philly office share or something?

Hi Tea,

Have you heard of co-working spaces? In specific, Philly's own Independents Hall (not Independence, but close by)?

http://www.indyhall.org/about/

http://www.indyhall.org/pricing/

As far as I know, it is a day thing, not hourly but contact the guys, they're pretty nice and you never know!

Check out The Hub.

http://www.thehub.com/index.php