I've bought several of the lights from DealExtreme. For the most part, they're OK -- low cost but low quality.
This one in particular is probably the best one I've seen of the dedicated bike lights. It puts out a reasonable amount of light and is reasonably well constructed. I'm not fond of AAA (I prefer AAs) batteries, but they're not that bad -- and needing 4 rather than 3 is nice, because more chargers can do 4 batteries at once than just 3 at once. In general, the older lights they have are inferior to the newer ones.
(Of course, the 900 lumen (really 400) flashlights are the real bike light winner from DE ...)
As for the speedometer, no idea. I've got several of the ~ $10 17 function Schwinn cycle computers from Amazon and they're quite nice.