I would like to know your experience in internal linking...
Is it helpful for you or not?
Well, I started doing within my site and my ranking is improving slowly, I would like to know if you are also doing this.
Internal linking works good these days, according to new changes in algorithm of Google i.e. Panda and Penguin.
If you are doing internal linking then make sure that it is looking natural, you should use different anchor texts every time you create internal linking, it would help.
Remember that a search engine’s ultimate goal is to surface the very best few pages about a topic on the web. With the focus that most linkbuilders and SEO specialists have on inbound links and developing links from other sites, it is easy to overlook how internal linking is important. If you’ve heard that inbound links are like other sites voting for your content and telling search engines what your content is about, internal links are like voting for yourself and also letting the search engine know about your vote.
Internal Links are hyperlinks that point at (target) the same domain as the domain that the link exists on (source).
The thing is you have to do it naturally, it helps, without any doubt, I would say.
Internal linking helps to strengthen your website, it is a really important part of on-page SEO. Just it needs to look natural, as it was already mentioned.