I have started using YASnippet for Emacs and one thing that I immediately noticed was the shocking lack of LaTeX snippets. Yes, I know that the auxtex package lets you do everything by using some keyboard shortcuts, but I find it much more intuitive working with tab completed snippets. I have therefore begun a project of creating a proper LaTeX bundle for YASnippet - you may find the snippets I create here [old link!].
Update: The snippets have been moved to a GitHub project - you may find it here http://github.com/madsdk/yasnippets-latex/
It is still a work in progress, but as soon as I find my bundle to be complete enough I will start releasing versioned "builds". As of right now you have to download the snippets individually from the download section of the homepage.