Just got this in via email from DotSter.com:

Buy One Domain, Get One Free
With each new year comes new opportunities.

THIS WEEKEND ONLY, purchase any .COM, .NET, .ORG, .BIZ, .INFO or .US domain name at Dotster.com, and get a second domain free!* Just enter coupon code BOGODOMAIN at checkout.

And the fine print:

* LIMITED TIME OFFER. BOGODOMAIN coupon expires February 1, 2009 at 11:59 pm PST. BOGODOMAIN coupon is valid for one new, one-year .COM, .NET, .ORG, .BIZ, .INFO, or .US domain registration with the purchase of one new, one-year .COM, .NET, .ORG, .BIZ, .INFO, or .US domain registration. All renewals after initial purchase will be at standard list price. Coupon is not valid with existing domains and services, renewals, other coupons, or special pricing.

Go get your buy one get one free domain at dotster today!