Strange PR

Hello everybody,

Few comments/questions. Firstly, my site is indexed, but not spidered (not apparently spidered anyway, if you type nathanwwong.com in Google, it's only the index), yet I have a PR. Is this normal?

Secondly, nathanwwong.com is PR 1, nathanwwong.com/index.php is PR 2, and all my other inner pages is PR 2. Why is it that the page without a file on teh end is PR 1? Any ideas?

Thanks for your feedback.