I just spotted this rather nice simple video editing suite from Pinnacle. It's free to download (150Mb) and has quite a few nice features that put it above the standard Microsoft video editor.
It supports flash and direct upload to YouTube, it also enables you to save your movies in a number of formats, many of which are compatible with a range of mobile devices such as i-pod and Sony PSP.
I've downlaoded it and it seems pretty easy to use. You can add transitions, text , music sound effects etc.
The catch is that if you want to keep using the codecs that enable you to export to DivX and Mepg2 - 4, then after a 15 day trial you'll need to buy those. Not sure yet how much they are though.
You can download it from: http://videospin.com/
If you don't need those, then this is a really handy video editor for free.
It runs on Vista and XP, but not MAC, but then if you have a MAC you won't need it.
Hope you find this useful