[timmm]

Development Tools

1. An HTML/CSS editor (FireBug for FireFox)

2. Network Traffic Monitor (Foxmeter for Firefox)

3. Cookie Manager (Advanced Cookie Manager)

4. User Agent Switcher (for Firefox)

5. Modify Headers (optional)

6. Javascript Console

Those are your tools for debugging, writing some things.

Technologies you will have to learn...

1. jQuery

2. MVC framework

3. API/JSON content calls

4. AJAX

5. Cookies (same/cross domain)

[deadfall]

I recommend trying out Chrome and Chrome developer tools. Very robust without a bunch of third party add-ons.

To add to your list jsfiddle.net is a great tool for testing out small features and experimentation.