In working with Drupal 7 I can say that there is now plenty of support and information to update. Items that have changed are:

1. Pre-installed core modules
2. Settings.php is done at root level on install
3. Modules can be updated via the intenet...after spending a good share of time updateing modules and then installing in the theme's folder.

Many more updates for handling and security. Read more at Drupal.com and then give it a go.

'What could go wrong?'..............................