Twilert is a free Twitter application created by Dan Leach which lets you get the Twitter search alerts directly in your email inbox. It sends you Twitter search updates containing any keywords you have settled via email.
One can keep track of the latest buzz on twitter world through this service and find more people in the same interest as you and socialize with them!

You can receive regular email updates of tweets containing your brand, product, service, well any keyword you like really.

It is extremely useful. Just type in your keywords to create a Twilet to choose how often you would like to receive updates by daily, weekly or monthly and wait for email updates of what you want.