Most of what I do with the computer this days is reading books / essays / blogs :-) / web / etc.
For those things, protraint mode is superb, as Scooble often tells us.
I don't have the dough to invest in a Tablet PC - prices in Israel are outragous, the cheapest model I found costs over 9300 NIS ($2,152.28), while my laptop cost less then 8,000 NIS ($1,851.2) for much better performance.
But I'm digressing, I got myself a LCD monitor some time ago, and the one feature that it has that makes sure that I would never go back to CRT monitor is that it rotate to portait mode.
It's a LG L1800P, and while it may not be the prettiest thing out there, it's wonderful.
For the games, I play HL2 on it and I can't notice any degration in performance then a CRT monitor.