hello everybody, i found last night that one of my blog had a pr1, just before yesterday its merely 0. i also have another blog which has more backlinks and older is still pr zero, so anybody help explain?

It's a challenge to update information on billions of websites overnight.. Give it some time..

Normally PR is mass updated on a web-wide basis. This happens several times a year. If Google finds enough PR links to your website before these mass updates, then you should get PR. Sometimes it does take Google a while to find some links. As feydakin mentioned, the PR update does take a while to affect all websites. I haven't heard anyone else mentioning a PR update lately though.

This not serious problem. Google update many web sites in 1 hour. You should waiting. You again get your PR.

google updates PR finally by getting information from its different datacenters and google update last for several weeks.... so just wait n watch if any changes for ur sites n blogs

Exchange links with relevant blogs with high PR. That would drastically increase the pagerank of your blog.

just continue link building your blogs..it will gain pr maybe not now but in the next PR update..

Whether your PR goes up now or in a week you will still get the same number of visitors and income, so really it doesn't matter too much.

This is part of the process if your one blog got PR then possibility of Google not finding the other blog on algo constant.