Don't quit your job to become a day trader.
It's arguable about how long Apple can keep up its amazing increases in sales and profits, but $90/share is an insane number baring something like a world war.
Apple's P/E at today's share price is ~15.
I don't trade stock...and frankly am not a fan of the Stock Market Casino.
I've seen and been at plenty of companies for the past 30 years that are $10 one year and $300 a few years later and back down to $15 years later.
For those of you who want to day trade and lock your money into 1 company or daydream about hitting the lottery/Apple stock lottery...great. Have fun.
Am I wrong or have we seen a rollercoaster ride a few times in Apple's history? Will it nosedive next year? Who knows....it's up to Apple to make money.
Let's also remember that in this high tech environment, Apple CLEARY does not sell to businesses. Apple sells to consumers. Fine. Great. Apple is a consumer electronics company. But unlike Bose and Sony (for example) Apple sells zippo to businesses. Therefore, Apple is (for better or worse) 100% reliant on consumers.
Apple has a few products and sells 100% to consumers...in my book that's either a great bet or a bad bet...depending on the year. iTunes and iPod is 10 years old. <yawn>. iPhone is on version 4 (I see iPhone following the same boring steps as iPod gen 4 and newer). iPad is coming on 3 and I am excited for this. Mac is not Apple's concentration but Apple is happy to make a hefty profit on those who like a sexy-looking computer. And let's face it, Mac will never have any kind of high marketshare (say 25% or higher) mainly because it simply does not live in the business world (please don't chime in about your 5-person company that is all Mac), does not have business applications, and fails to have any kind of business-class support/tech support.
I'm not spelling doom and gloom...but just getting people to think a bit more about what Apple has (as far as we know) in its product line and Apple's extremely high value right now.