If you are using Firefox, there is a plugin available to switch your useragent called User Agent Switcher.
Once you install that, then in Tools > User Agent Swicher > Options > Options
Click on User Agents and then Add
In Description field type in : “Googlebot” and In User Agent Field paste the below line.
Mozilla/5.0 (compatible; Googlebot/2.1; +http://www.google.com/bot.html)
Click OK.
Now in Tools > User Agent Switcher
Choose Googlebot.
What this does is that it disguises your browser as a Search indexing Robot and Many sites which require registration will now be accessible to you. Since many sites allow Googlebot to access their site without registration because they want Google to index their site.
Of course for regular browsing you will need to switch your user agent back to default.
You can switch your UserAgent in IE too but that is more cumbersome. I hope most of you are using Firefox and not the silly IE.