I had many sites down when the pr update came, the last one, will i have to wait to the next pr update or has my sites been included in the pr update? Its strange cause i dont see any increase in pr making me think that if a site is down under an update pr will not change, either high or low.
I don't think that it matters to google page rank if the site is down or up the day it gets updated. As it checks site stats every day and only updates toolbar data once per sever months.
It probably depends how long the site has been down for..If we're talking hrs or maybe a half day then it probably wouldn't have any impact. If you have some kind of default "Under Maintenance" page up there then it shouldn't effect it at all..As long as the quality links are still dumping the juice and there is a page there the PR should adjust accordingly.
PR is changing constantly every single day, Google's algorithms wouldn't work if it didn't. What you call a PR update is just an official update of the toolbar. They do this mainly to make it harder for people to game the system.
It takes weeks and weeks to calculate ranking by google so, even if your site is don for a day, your raking won't be affected