A couple of things Ive been meaning to ask for ages!

1) In Google Analytics, I sometimes see visits to my website with a length of "00:00:00", how is this possible though?? Surely there must be an error in that?

2) Does Google crawl through dynamic content? Ive searched for some of the text for some of my portfolio entries on my website (the content comes from a MySQL Database) and some of them show up in google results, but some dont! Even some of those that don't show up have been on my site for ages, so surely it can't be that Mr Googlebot hasn't had time to visit them?

1) Depends on where the analytics code loads. If the code loads late or last in the page the visitor may have already made their choice.

2) Yes it does. If the pages are "important" enough they will should get indexed. If not, they won't.

Thanks! Do you know what would mean the difference between it being important and not?

Or is it one of those mysteries that is only known by the Google head-honcho himself?

"important" normally means better quality natural links (or thousands of self placed links)