When I started my blogspot blogs, I immediately update my Google Accounts. I added my blogs in www.google.com/addurl so that my posts will be searchable on the Web.
I also activate my webmaster's tool like add the meta tag on the layout of my blogs to verify that I am the sole owner. Luckily, it was verified successfully. Then, to make my blog more nice looking, I added some feeds widget and activate more SEO. But, when I delete some widgets, it started to return a google error. When I deleted some of my posts, it also returned an error.
To get the PR is so easy especially when you just started. My blog was in PR2 when I decided to change my layout . Then, it happened! All my rankings goes back to ZERO. I console myself, its okay. I will enjoy blogging anyway. By February, nothing happened. It was because ( I just knew lately) that I have to verify my blog all over again.
When I change my URL, I did not verify my blog. Google crawl nothing so, PR is impossible to get. Everytime you change a layout and change URL, you have to verify, submit or register your new URL all over again. So, I learned my lesson. Right now, I am still in the process of communicating with google for my blog's reconsideration. I hope, google will be kind enough to give my PR back.