Just wanted to let you all know about Searchify. It's a free app I've developed that hooks in to the Android Quick Search Box (and the Google search widget) to let you do all sorts of things.
Searchify lets you perform translations, calculations, unit conversions, wikipedia searches, calendar entry and more just by typing in searches. On the Droid it's even easier as it's got a keyboard - you can just start typing in the home screen to do all these things.
Some of the things you can do with it:
Unit convertor: type a quantity (e.g. “10 pints” or “5 oz”) into the search box to see a list of conversions.
Calendar entry: Type an event in text (e.g. “tue 3pm meeting” or "tomorrow 3pm - thursday 5am event @ John's") to add it to your calendar.
Translator: Type “translate” then a word or phrase in any language to see translations into languages of your choice.
Wikipedia: Type anything to bring back search results from Wikipedia that will link you direct to the Wikipedia page.
Calculator: Just type a sum right into the search box.
Keyword search: like in Firefox, type e.g. “twt android” to search twitter, or “dict something” to search a dictionary.
To get the app to work you have to enable it in Settings -> Search -> Searchable Items. Also like any app that works with the Quick Search Box, at first the search results appear under "More results...", but once you've used it a few times they'll appear in the main bit of search results.
I hope you find the app useful!