Trackbacks give you information about your website and its pages being mentioned on other websites.
It happens mostly when you publish valuable content both on your blog and in such article directories as: Ezinearticles, Articlebase or Goarticles and other ones with links back to your website. Such articles are then republished by others.
It is a great, natural way of getting more backlinks!
Value of indexing
Such backlinks matter, however, if the pages they are part of get indexed. Otherwise they are simply worthless.
There are several ways to help index those pages. Long and time-consuming method envolves grabbing their RSS feeds submitting them to RSS directories, pinging them and socialbookmarking them. There is, however, an easier way.
There is a plugin which I use on my niche sites: blogs where I have Google Adsense ads and similar ones. What the plugin does is it automatically checks your chosen websites where your backlinks are, to find out if they are indexed.
To take full advantage of trackbacks and make the indexing process faster, indexing plugin comes together with trackback plugin. It scans your whole website searching for the trackbacks. Indexing tool will then check if the websites with your backlinks are indexed. You can help to index those backlinks faster by allowing displaying them on your website. Indexing tool will make sure that whenever any of those other pages get indexed the trackback will be automatically deleted from being displayed on your website.
How it can help your website
Using indexing and trackback plugins, you will get a lot of indexed backlinks. They are one-way juicy backlinks. The most important thing is that it happens automatically. You set it up once and it works in the background of your website. It is a huge leverage of time and money.