incrediBILL - 6:57 pm on Oct 3, 2010 (gmt 0)
Of course this actually bloats the individual page downloads and all page loads appear to be larger and slower and loads junk into the page the SE's typically don't need.
Combining into the minimum number of files is the best idea for overall performance.
PRELOADING - Something I've been experimenting with recently is preloading content based on the path a user is most likely to take through our site.
When you get too much preloading going on it can impact overall server performance not to mention you're just wasting bandwidth based on an assumption.