I was shocked to see how much traffic my blog generated when I did my first ping. It's almost like my site was blasted on the radio a couple of times. If you are not pinging you should definitely start.
So what is pinging? Pinging is an Internet program used to test a connection by sending a ICMP or an Internet control message protocol. Basically it lets the engine robots know that you have updated the content on your site. The best part about pining is that if done right you will see almost an immediate growth sprout in your traffic. If you want a service that will do the pinging for you, you can pay and they will automatically update for you.
If you choose to go the free route. Checkout Pingoat.com they will do this for no charge. You can't ping back to back but they give you a reasonable amount of time to be able to start pinging again.
Pingomatic is another one of my favorites. They actually sell the service but they let you ping for free. I think the service is like $17.00 or something low like that. It's definitely worth it.
You can also ping yahoos servers. You can do this by doing a copy and paste in your browser. Use this address:
Put your address in the "your address here section" and then press enter. This will automatically tell yahoos robots that your site has been updated.