The Logitech LX7 is a cordless mouse. I've been using it for about 4 months and rather enjoy it. It is recoginized immediately when plugged in (I use with Fedora Core 6, tested with Fedora Core 7), but needs a little tweaking as the default pointer movement is a little fast and you need to get the extra buttons recognized.
General Linux
Other Linux distributions, besides Fedora, or items that pertain to Linux in general and not a specific distribution.