Just got an email from zipcar offering free $25 drive credit. Read below for instructions.

Knock knock. It's been a few months since you've taken a MINI out for a
spin. Actually, it's been a while since you've driven any Zipcar -- BMW,
Civic, Truck or Hybrid. Maybe the holidays have you in bed with the
covers over your head -- and we don't blame you -- but don't forget that
gas, insurance, and 180 miles per day are included in every Zipcar
reservation every time.

As of today, there is a little bit more included with your next
reservation -- $25 in driving credit.* Sure it's a holiday gift, but if
your schedule is anything like ours, it's more like a holiday helper.
There are errands to run, gifts to tote and maybe even some festivities
to attend. Plus, everyone likes to save a little money this time of year.

To redeem this $25 in driving credit, enter the code DriveNowPHL at
http://www.zipcar.com/gift/redeem

See you on the road again soon,

The team at Zipcar Philly

*But you gotta hurry. This driving credit will expire December 17, 2008
at 11:59pm. The credit must be used before then and does not count for
reservations made after that date and time.

zipcar | wheels when you want them (TM)

Thanks works like charm... I am not even a member from PHL, it still works.

Might be dead. I'm getting "We Had Trouble Finding What You Were Looking For...".

When you click the link remove the "period" at the end... it worked for me!

Worked for my friend in San Francisco....

Thanks OP!

The DC code also worked for me for another $25 credit ($50 total so far!): Link

Maybe we need a thread to consolidate these codes. Reposts are popping up in Deal Discussion, Hot Deals, and Free Stuff.

FYI: if anyone want's to brute-force it, here are the Zipcar cities are: Atlanta, Boston, Chicago, London, New York, Pittsburgh, Philadelphia, Portland, New York, San Francisco, Seattle, Toronto, Vancouver and Washington, DC.

I got the San Francisco newsletter, and there was no code, and "DriveNowSF" doesn't work.

Thanks OP and agentjfong!

Both codes worked for me and got 2 $25 credit that expired Dec 20, 2008!