SeekingAlpha is really an incredible tool for monitoring your investments as well as actively looking for new ones. As far as I know, it is unparalleled by any other service. I highly value SA’s comprehensive presentation of a company’s P&L, CF and Balance Sheet all in one place as well as highly useful industry peer comparisons. What I think is really helpful are the alerts as soon as one of the stocks in your portfolio is at risk of bad performance (it really saves you a lot of efforts), especially with things like impending dividend cuts. All in all, SA is highly serious and a handy tool for every investor out there.