Finally got fed up, uninstalled the Logitech, and plugged my cheap Sony camcorder in. Started up Trillian, and the Trillian Skype plug-in started Skype as usual. A notice from Skype popped up saying my video was working. I clicked "See video", another notice said "Skype is not compatible with your webcam". So, I selected "WebcamMax" as the source, and as soon as I did, BSOD again! Being I rarely use Skype anyway, I decided to just go ahead and uninstall it also, thinking the recent update it had might be causing issues also.
Haven't tried MSN yet... probably won't bother trying it till tomorrow. It's odd though, webcams work fine if I'm uploading the still images every 20 seconds to my website, or if I'm streaming to Justin.tv, but as soon as I try to conference with someone, BSOD! If I keep having issues, going to go ahead, back up my data, and re-install Windows. I used to do a clean install every year and a half or so, but I've been "lazy" lately and haven't re-installed since getting this computer a little over three years ago. If it doesn't help the problem, it won't hurt either. The blue screen of death only started showing its face a few days ago, after some updates.