depends on the type of league and the rules, etc. but here's some links to articles i like
has several good articles
also check the mock drafts on this site to see where players are generally going
the strategy i've been doing very well with this year is:
Round 1- best player available
rounds 2-4 fill in infield, assuming top studs are still on the board (ss-tejada, nomar, jeter, renteria 2b-boone, kent 3b-rolen, chavez)
after that i fill in with OF, 1B and pitchers. I'm always surprised at the quality of players still left at these postions, and there are many more sleepers there too.