Hi,
Recently started LR myself.
First thoughts: Wow. Processed 50 images in about 10 minutes on my first play with it. Compared to CS2, I've saved myself a good hour!!
Adobe: My girlfriend thanks you! 
A Q for anyone who's a little more experienced:
When creating a folder structure in LR, does that work directly from the folder structure I'm using in Explorer. For example, If I start with a folder named '2007' and that has sub-folders named for months 'January', 'febuary' etc... and then sub-folders by day.... Does LR use that structure too when you import images to LR?
And, when creating a collection, for example I want to keep all my bird, animal, lizard etc... pictures together in one easily accessed group, do the pictures move, or does LR just create 'pointers' to that image? \so, any new bird pictures can be 'flagged' to be added to my bird collection easily, without moving the image from its 'actual' location inside, for example: 2007>Febuary>16?
And, a final one, thanks for your patience!! When I import new pictures just taken freom my camera, if I use the LR camera importer (forhot the actual name of it!) can I set it up to automatically create and place the pictures into the correct folder, following my folder structure (detailed above)?
Thanks fellas