What are the most Important Usability, Accessebility and SEO guidelines?

Question

Can anyone tell me some of the most important usability, accessibility and SEO guidelines, which must be taken into considerations while developing a good Web2.0 website ???

Answer 1

http://www.w3.org/WAI/
http://www.section508.gov/index.cfm?FuseAction=content&ID=12#Web
http://www.google.com/support/webmasters/bin/topic.py?topic=8522

Don't get too hung up on the "Web 2.0" buzzword. Accessibility standards have been around for a long time and are an important part of any web site.

Answer 2

SEO hint: Rewrite your dynamic URLs so that even the actual URL may be dynamic, it appears static. This allows spiders to fully index your site.

On Apache, you can do this by using mod_rewrite and there are symilar techniques for IIS.

Example:

Instead of

http://yourdomain.com/cgi-bin/getproduct.pl?id=12345

use something like

http://yourdomain.com/products/12345

As an alternative (or additional measure for those dynamic URLs you cannot rewrite), you should create a site map.