chuskey, did this issue ever get resolved?
I'm currently suffering from a very similar issue;
I'm using a Logitech 'Wave' Mouse/ Keyboard combo via USB receiver and running the SetPoint latest 6.0 driver (Vista driver for use with Windows 7 x64).
On occasion, when typing (especially into forms, e.g. Start Menu search field, online forms etc.) I get very severe delays between keyboard input and character display.
I'm talking from anywhere between 5 - 30 second delays...
I've contacted Logitech, who's solution was to empty the cache of the keyboard via battery removal, but the problem persists.
I have a sneaking suspicion that the issue lies with Win 7, not with the hardware itself (Computer & Keyboard are 8 days old)....
Can anyone suggest any solutions?
It's very very annoying...