Just head over to Web 2.0 V2, type in the logo text and specify if you want that mirror reflection effect or the starry beta stamp [which now comes like Fries will all Web 2.0 apps]
Overall, a nice way to create impressive website headers without learning complex photo editing software. [Thanks Steve Rubel]
You may also be interested in The Logos of Web 2.0 - a huge gallery of logos appearing on Web 2.0 websites with links to the actual font used in the logo design.