I wish!! No hi-def sources, unfortunately - I'm just viewing regular standard PAL definition sources, and the occasional high-def video from the internet, although these often stutter on my PC. The best source I use is PAL DVD's, with the Nebula coming a close second.
Still, my NTSC HDTV, when combined with an HCPC, makes a nice display for PAL sources! Better IMO than most of the PAL big screens that I've seen in the shops.
I believe that 540 lines (NTSC), isn't really enough (especially after overscan) for PAL viewing. Hence I use 1080i. But in all honestly, the difference (when viewing DVD's/TV) at 540p vs. 1080i isn't huge. But it is also useful to have more desktop space sometimes (some programs require at least 800x600), and some games will run at 1280x1024i.
One day I hope to find a satellite box that outputs at 1080i @ 60hz. That would solve some problems, especially if the satellite material is high-def.