Drupal 4.5.x or older

Google launches new Drupal code search

http://google.com/codesearch?q=drupal&btnG=Search+Code

well... not exactly :)
but you can seach Drupal code as well as all code in universe

is it possible to do the upgrade directly (changing files, running update.php)? anything special to watch for?
or should i do it step by step? as in 4.4 to 4.5 then 4.5 to 4.6.3 and so on...? (like in http://drupal.org/node/75047)

Please check my site for the error:

http://herman.redirectme.net/rocket

It was working fine for over 1 year. Now this is the error:

Notice: Undefined offset: 0 in D:\web\rocket\includes\bootstrap.inc on line 452

This is a site with screen font style 'preview' tools and to get the css style code
useful when you design your own theme. I though it will be useful tool for Drupal theme developers
'what you get is what you see'

http://typetester.maratz.com/

I was wondering whether Drupal is what I am after.

What I want to do is start a help webpage, but instead of me just providing static help, I would like to set up another site (and this is where I am hoping Drupal comes in) that allows me to upload my own help and have it tweeked and commented upon by others, who may be better informed than me. So, they could comment and thus force a change in the help. Correcting mistakes, etc. So the help is 100% correct and helpful to most people (or, at least close to it as possible).

What do you think? Any advice is welcome!

http://popsops.com Whether will approach for my site Drupal?