voiceNote is a clever service that allows you to add audio clips as notes to your Backpack pages.
It requires you to register your name, email address, the URL of your Backpack page and its email address on the voiceNote web site 
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Then a quick call from your mobile/cell, work or home phone adds an audio note to your page:
This allows you to capture your killer thought on the move or in the car. By registering and sharing your voiceNote number, you can even use it as a voicemail service for friends or for work.
Currently the service is in beta and works for the cost of a local phone call in the following major US cities: Denver, CO, Washington, DC, Chicago, IL, New York, NY, Pittsburgh, PA, Houston, TX and Seattle, WA.
I thought San Francisco was the beating heart of all things Web 2.0. Surprising not to see it on the list.
The service is free.
Wow! This is great—test run worked beautifully. This is the sort of thing that 37signals should include normally — I wonder how long it will take them to pick this up.
Since one of the ideas is to split strings not into words, but hopefully into phrases more semantically informative than the words they are made of, doing that better should mean better suggestions, and avoiding what essentially are word n-tuples should make for smaller data and slightly faster querying.