My son is graduating this year and is committed to a 4 year university. He will turn 21 about 1 month after the completion of his sophomore year in college. Will he be eligible for the 2011 draft because he turns 21 within 45 days of the 2011 draft?

I heard that 45 day rule and I wanted to confirm.

Look at the
PG CrossChecker summary. It confirms the 45 day rule for the 2008 draft.

You can also see a less detailed but semi-official MLB draft summary at MLB.com, which also tells you how to get a direct answer from MLB. Might be a good idea for future drafts, since the rules could change.

From what I have seen, very few players get drafted and sign after their sophmore year in college (not redshirt). The ones I have seen, unless of unusual talent, get drafted late because of signability. They usually demand more money (due to two years left of eligibility) and most teams do not want to pay it, or the two years left of college.
JMO.