Best application to monitor stocks (with alerts)

[gof]

Can anyone recommend a good (free or pay) application to monitor stocks? Ideally the application would be able to also track cost basis (so you know your gain/loss) as well as provide alerts if the price shifts. I can do some of this via my regular account, but it would be nice on my mogul.

I don't *need* this on the today screen, I'd be more interested in expanded functionality without having to sign onto my brokerage account (which just takes more time on the phone than casual info-grabbing justifies).