Google has launched a website for their URL shortener here.
Google says:
Stability: We've had near 100% uptime since our initial
launch, and we've worked behind the scenes to make goo.gl even stabler
and more robust.
Security: We've added automatic spam detection based on the same type of filtering technology we use in Gmail.
Speed: We've more than doubled our speed in just over nine months.
You can also get an extension for Chrome or Firefox.
Extra!! According to Matt Cuts, if you add .qr, you get QR code!