I gave the screen a good clean and recalib (a few times for good luck) and so far things are looking better. I can even drag the cursor around when typing. I'm going to be using the tab for the next few hours so will definitely give it a good test.
So, how's that been working out for you (since it's been way over a "few hours" now)?
As I mentioned, ALL of my touchscreen devices start acting weird as more an more finger oil/grease and crud build up on the screens. I will admit though that my Archos 101 G9 seems to be the most touchy (pun) of the whole bunch though for some reason.
Some other devices come with a special coating on their screens that somehow resist finger prints and oil, but those are also much more expensive devices.
There are some screen protectors that also "claim" to have that, but you have to make sure the screen is REALLY super clean before applying one of those... and even then sometimes the adhesive of those start causing weird problems.
I don't worry too much about all that though because I figure all the "new" electronic gadgets I buy are going to end up in my "spare parts" junk pile in about 6 months anyway. There's just too many "new" things coming out almost ever couple of months now days. If I really wanted anything that I'd keep around for a longer period of time I'd probably buy something more expensive from Asus, Samsung, or (puking, gagging, almost about to die saying it) Apple.