In fact, Georgia is a no-brainer kind of choice if your site is text-heavy. It needs to be opened up a bit -- the line-height should be around 1.4em -- but it makes the right word shapes (most "expert" reading happens at higher pattern-recognition levels than letters) without sacrificing clarity at the level of letter shapes and letter-spacing (as, say, a Garamond or Palatino might). Serifs make a huge difference in readability. They just got a bad on-screen reputation from implementations like Times New Roman on Windows (which is more of a weak encryption scheme than a legitimate typographic decision).