I've just got back from my holidays (Yes, I do take some!), and one of the many emails sitting in my inbox was from a chap called Nick Zara, who has written a number of articles over at Windvis.com.
Windvis.com is aimed mainly at beginners and intermediate users of Windows Vista, but having a look around the site, there are also some more advanced topics, such as Speeding up the Windows Vista Start Time and Using a Partition for your Swap file.
The site also uses a number of screencasts to illustrate the tutorials even more effectively - shame they aren't on Soapbox Nick! ;-)
So, make sure you check out the site, and also subscribe to the newsletter if you are interested!