1280x1024@19" monitor. Any lower resolution on my 19" looks preety bad for me. I build, submit and watch the sites in this res, and I personally think that this is kind of standart these times. I know that a lot of people still use 800x600 or 1024x768 (in work?
).
Btw, I know a lot of different peole and the lower res they use is 1024x768.