BenFox - 9:05 am on Jan 6, 2011 (gmt 0)
If raw PR is still used in the algo then showing an accurate number (3 significant figures) in WMT would help SEOs backwards engineer it.
The toolbar PR (which displays to 1 sig. fig.) is a pretty useless metric in the grand scheme of things. If you want a single, simple metric to act as a health check then you'd actually be better off looking at the number of root domains linking to your site (which is far from ideal).