First of all, thank you guys for the great work you've done to TortoiseHG! I just enjoy version 2.0.
I'd like to make a suggestion that you might find useful. Update, commit and merge are such a common operations that it might be worth to put corresponding buttons to the main toolbar. For example, to update to a revision one has to right click on it. But Mercurial itself has a great simplification of commands, like 'hg update' which by default update work directory to the tip of the current branch.
Operations like 'hg incoming' and 'hg push' are already in the toolbar. Making the 'Update' button would make following repositories two-click actions (pull, then update).
The same with 'Merge' button. It is often obvious which heads should be merged and which head would be the first parent. It fits very well to the Mercurial use patterns.
Commit button is the one I less certain of. Commit action in TortoiseHg is very simple as it is. Maybe such a button would make common Mercurial operation set more complete though (Commit, pull, merge, update).
One again, it is only a suggestion and, please, sorry if it is not useful or doesn't feet the design concept.