TortoiseHg is completely different than TortoiseGit, despite the similar names (and logos). While the latter is an assortment of context menus and dialogs, THG has this plus a great "workbench" which combines everything into one. It's easily possible to use THG alone without ever touching the command line which is a rather nice feature when trying to convince non-programmers to use version control. If there was a git equivalent, I'd happily use it.