Since I often participate in Microsoft beta exams and books are not available at that time, I spend a lot of my time using Technet. Here are some personalizations I use:

Technet library view type:

For people who’ve been using the Technet library for many years, they are probably familiar with the “Classic” interface shown below:

Until a couple of weeks ago, I thought this interface had simply been replaced by a new “lightweight” interface. You can however change the view using the settings button  to match your preference.

Technet library Print/Export multiple topics

Sometimes you want to easily bookmark topics for later (offline) use and possibly even on other devices. The Print Multiple Topics feature provides this functionality. Be sure to try it:
http://technet.microsoft.com/en-us/library/export/help(lightweight)

Some more information about this feature can be found here.