Yesterday i was just checking my facebook account I was surprised that I ave around 50 application request. First I just tried to manually delete them one by one but after going through the process with few of them, i got bored, and decided to go for an alternative.
Then I came across the site called ignoreall.com; which enabled me to instantly delete the all facebook application requests while retaining the friends and group invitations.
Ignore all uses a java bookmarklet known as IgnoreAll, to get deleted all the requests related applications in just a single click. What you all need to do is just right click on the link (on homepage), select the option of Add to Bookmarks and when you want to use it the next time, just click on it in your bookmarks and it shall remove all the requests for you.