Weather applets

He said "radar pictures". I don't know where you are but many areas provide relatively up-to-date radar, updated multiple times an hour; even every 5 minutes or so.

I too find this very useful (although I use Gnome and their weather applet); for New England winters getting out of work before the snow hits can make the difference between a 45 minute commute, and a 4.5 hour commute.

For whatever it's worth I find it more helpful as an applet, than looking it up on the web.