I am wondering if it is good to have index.php be rewritten to just the url name? I mean, making this: http://www.vbulletin-fans.com/index.php show as http://www.vbulletin-fans.com/ ?

what do you think?

not worth the time. index.php seems fine to me

Probably. I've had sites where index.php and / had two different page ranks, which says to me that there shouldn't be two.

index.php on this site is PR5, / is PR6. stupid system

Most search engines prefer just the domain / some html files get indexed, but i really rarely see index.php get indexed..

I really hope this changes, and i have heard rumors that it will..

For an example:

Search google (http://www.google.com/) for support (http://www.google.com/search?hl=en&q=Support) and check the results..

http://www.google.com/search?hl=en&q=Support

I prefer having 1 URI for the same page, yourdomain.com/ and yourdomain.com/index.php are 2 different pages.

I am using following redirection in .htaccess

RewriteCond %{THE_REQUEST} index\.php
RewriteCond %{QUERY_STRING} ^$
RewriteRule ^index\.php$ http://forums.techarena.in/ [L,R=301]

Good tip SaN-DeeP :)