In a previous post, I talked about some common usages of Andar.
Well, I came across a site called ReVerb Spanish, which is actually quite an interesting site, but what caught my eye was this post about Andar vs Estar. It's a good post that not only gives you more advice on using Andar, but shows you how Andar and Estar can be used as synonyms in certain situations.
Also, be sure not to miss the downloadble podcast at the bottom of the page, good stuff.
If you haven't read my post on Andar, you can read it here. You don't have to read it first, but I think it's worth reading in conjunction with the Reverb Spanish post.
¡Hasta la próxima!