I'm very confused. I was just about to pre-order Windows 7 - Home or Pro (undecided) when I noticed that Ultimate is the one described as being multi-lingual! Does this mean that I can't even WRITE Arabic on the Home or Pro editions? Or switch languages? I've been able to do this just fine on Windows XP and on my current version of Windows Vista Home Premium! Do I need Windows 7 ULTIMATE just to be able to work on Arabic documents!?!?

No. There will be "Language Interface Packs" even for 7 Home Premium and Prof (18, don't know if Arabic is included) that translate ~80 % of the Interface and surely allow switching of keyboard layouts. 7 Ultimate will contain 35 "Multilingual User Interface Packs" (Arabic included) that translate nearly all of the UI.Mobile AMD64 3000+, VIA Apollo K8T800 chipset, 1 G RAM, ATIRadeonMobility 9700, 20x DVDRW, C:XPSP3 (55G),D:WIN7 (25G),F:DATA (250G)