JOELBYDESIGN

Allows you to send SMS messages to multiple recipients for free.

Allows you to create a private, disposable chat room online.

A site that will tell you which of your online display ads are most effective. Great concept! via

A site where allowing you to either advertise or publish advertisements on a targeted network of blogs.

Sign up for an account to see a variety of statistics about your site, including demographics!

A fantastic tool giving you a dashboard-like interface for viewing the latest buzz on any particular topic. (Hint, hint: Try putting your product or company name here!)

BuddyPress is a spinoff of WordPress for social networking.

Got an image you want to make sure no one is copying? Just want to see how many times the Mona Lisa is shown online? TinEye is incredible.

Create a futuristic display of photos or images using one of these various Flash-based presentations. Very impressive looking.

An nice take on connecting those who want to learn about any particular topic with those who have the knowledge.