Gauge Your Favorite Website
Just posting this here because I think it's extremely helpful and not everyone has heard of it.
The site is:
Where you can measure traffic to any website you wish. From an investment standpoint, it's one of the few places where you can get a realtime pulse on some large companies.
For example, witness the collapse of the New York Times:
The rise (and seeming stall) of Google:
Google's rise at the expense of Yahoo:
And the reason Google bought YouTube:
(Notice that the rise of YouTube correlates closely with Google's stall).
Anyhow, just a fun site that's chock full of interesting information waiting to be uncovered.