The current trend on web applications are centered on the user, the user's (generated) content, and collaboration (sharing and communication) between the users. This is referred to as Web 2.0-type of web apps. Implicit here are highly-available web applications servicing many, many concurrent users.
Why not think big when deploying your Web 2.0 app? You should. Think supporting a couple of millions users, 24X7, with lots of bandwidth and storage.
You need to plan for this. You don't want your web site down because of poor planning.
See 12 steps for infrastructure and capacity planning.
ceo
[Image source: Big Stock Photo]