so i just upgraded to wordpress 2.5. i went to my admin pag and it told me i had to update, just like wordpress always does. it even said that things went fine. then when i went to log in, my wp-admin/index.php page was blank! great!
well i didnt see anything on the forums so i went sniffing through some code. dont call me a debugger, ive probably made things less secure, but if you comment out line 7 from wp-admin/index.php things will work fine!
change: wp_dashboard_setup();
to: //wp_dashboard_setup();
upload the changes to your sever and youre all set. im sure someone out there will tell me how this is a bad idea. in fact, imve probably made whiffer less secure. so dont tell me what ive done, hack me… 
i lost a few comments on this one. i want to say it worked for most people.
i had recently gotten this comment:This worked for me too, but much of the functionality and links from the Dashboard aren’t working now…
i will look into this. of course, i know this solution is just a work around. i havent had time to look around at why i/we even need to do this. i thought one of the WP releases would fix this.
new fix: update to WP 2.7
This happens when there’s an index.php file in your wp-content/plugins directory. Lots of people think that putting one there is a good idea to stop people from snooping directories via your webserver, but that should be handled by .htaccess.
WordPress allows you to customize your dashboard by using the wp-content/plugins/index.php file. So if it’s blank, you’ll have a blank dashboard
woohoo free drugs!!!