First, I'd just like to add my vote and say this regression is a serious problem. Interestingly at least one person noticed this bug during the Office 2010 beta
http://www.techtalkz.com/ms-office-help/39289-aligning-objects-inside-canvas.html
Secondly, I mistakenly marked the above comment as a potential solution to this problem. :-) Finding a bug in the first 10 minutes of using my shiny new copy of Office 2010 + too much coffee made my mouse-ing hand a little twitchy.
To Microsoft Office developers: Please please please, fix this bug. And please don't wait for a service pack!
To err is human, to fix bugs in a timely matter is to have customers in the future.
Unfortunately, my experience with reporting bugs to MS about Office is that at best they get acknowledged and rarely get fixed.
Here's hoping I'm wrong.
YES! MICROSOFT PLEASE FIX.
To repeat: You cannot align objects/shapes inside a canvas in Word 2010.
So why use a canvas at all?
One reason is that without a canvas, you cannot use the "lasso" or "select area" tool to select multiple objects at once. You can use the selection pane, but even there you have to hold "ctrl" and click EVERY. SINGLE. OBJECT. This all adds up to a real
PITA for anyone who tries to use MS Word to create a drawing with more than a few objects.