Sorry, but IMO for AAPL to hit $500, the market cap would simply be too much to hold it - PE would be pushing 40+ without a huge increase in earnings.
Look at XOM - their market cap is 330 Billion but PE is 12ish.
People say why not AAPL at $500 with BIDU, PCLN, AZO, etc. but their markets caps are all much, much lower, meaning there are less shares for sale.
I also think IPad sales might disappoint somewhat, just because some people are so bullish on it. Not saying it won't sell millions, but if it misses 45 million for '11 or whatever, look out!
Also, at some point, someone somewhere is going to sell their Apple shares to make a down payment on a house.
JJacksET4