If you write a blog, post pictures to Flickr, or do pretty much anything else online these days, odds are you've typed a few tags to go along with your picture, video, or blog entry. Tags make it easy for people, search engines, and advertisers to find stuff online.

But coming up with accurate and useful tags can be a lot of work. And there's a science to finding tags that will help increase your search engine traffic or advertiser revenue. Good luck if you don't have a degree in this particular science.

Jiglu is a new service that takes all the hard work out of tagging. Just enter your blog URL, sign up for an account, and Jiglu will spit out a bit of code that you can embed on your webpage. Jiglu integrates nicely with WordPress, Blogger, TypePad, and other popular blogging services.

Next, Jiglu goes to work analyzing all the text on your site and generates a list of relevant tags divided up into topics, people, events, and links. Jiglu shows up as a widget on your page. Scroll over it and a list of tags appears. You can click on a tag to bring up a list of matching stories. Or you can click on the Tag Map button for Jiglu's version of a tag cloud. Tags with larger fonts represent items that show up on your website more often than tags with smaller fonts.

The service is free to use. But when users click on a tag, the list of items matching that tag show up in a Jiglu pop-up window which includes advertising. You do not get a cut of the revenue generated through these ads. The company also plans to launch a premium fee-based service for websites with over a million monthly page views.

[via Mashable]