...since using the Spyder device and associated software, I've noticed that the mouse pointer is very blue. In addition, video files played in Windows Media player etc have a noticeable blue cast.
I've been using Colorvision's Colorplus spyder for just under a week now and I have to say it't not quite what I expected. After calibration, my monitor has a slightly red (warm) cast. I assume my monitor is correctly calibrated, but I can't say I prefer it to the way it looked when I was using Adobe Gamma (nobody laugh). If I had a printer then I could use the spyder more conclusively, matching prints to what I see on my monitor, but for now I have to say I don't like the way my monitor looks after calibration with the Colorvision spyder.
Also, like Stephen, any part of my mouse cursor that would normally be white has a pale clue cast - very odd I think.
In any case, I guess we both might have the same underlying question, which is, why are we noticing these particular color cast (red for me, blue for Stephen), and what's up with the mouse pointer?