English QWERTY, though I've dabbled a bit with Dvorak since lately I confuse letters in QWERTY too often (I type fast and with both hands and they sometimes go out of sync
Occasionally I switch to US International, for letters with accents, or Maori - for marking long vowels in Latin
For Arabic I use the Jordan 101 layout, I haven't seen many differences between the different Arabic layouts in Windows though.
For other languages I just use the default layout, it's not as if I type very fast in them
My language pages: http://babelfish.50webs.com/
מן המקום בו אנו צודקים לא יפרחו לעולם פרחים באביב (יהודה עמיחי)
From the place where we are in the right, flowers will never grow in the spring (Yhuda Amihay)