UPDATE: My camera did return to life. Based on something I saw on some web forum, I popped the battery in and out several times, after which it mystically returned to normal operations. It still makes me rather concerned... but I'm just glad to have it back!
UPDATE #2 - April 5, 2010 - I wrote this post back in 2007 and have actually switched this year over to using a Nikon D90 as my main camera. However, judging by the comments this post continues to receive, the Canon SD1000 still has this issue, and... many people seem to solve the problem by simply giving the camera a good solid whack on a hard surface or blowing compressed air on it. I didn't have to do that, but others did. Read through the comments for various suggestions and links... and obviously use your own discretion with regard to the risk you want to take (or not take) with your equipment. (i.e. the responsibility and choice is entirely yours if you whack your camera too hard and break it...)
Woke up this morning to find that my Canon SD1000 point-and-shoot camera that I carry with me all the time at conferences seems to have died. When I start it up, I hear 6 beeps and then get this error "Lens error, restart camera". Yikes! Switched out the battery. Switched out the memory card. Tried various incantations. Still dead.
Suggestions are welcome if anyone reading this has had the issue and figured out how to fix it (outside of bringing it back to the store... which isn't an option for me until next week when I'm back in VT).