Over at my Challengers blog on Cnet News, I wrote about happy developments this week for two of my favorite scrappy Web services: DuckDuckGo and Wolfram Alpha.

Bing and Wolfram|Alpha collaborate.

Twitter explains new retweeting feature.

Microsoft: Windows 7 imitates Mac.

Google makes SafeSearch even safer.

Dislike YouTube ads? Skip ‘em!

Microsoft disconnects Xbox game pirates.

iPhone app developers get tracking.

Tour Bill Gates’ house: $35K.

Vimeo videos, now on iPhone.

Snow Leopard update dislikes Atom.

Gizmodo loves Nikon’s projector camera.

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