It's been a while since I've updated the Caching Manager, which is a module on the Sitecore Marketplace, so during a recent upgrade it was about that time. I'm using the design from Sitecore 8. It's backwards compatible through Sitecore 6 (SIM makes this possible) so there's no excuse for not getting it. Unless, you're on 5? Was caching on 5? I honestly don't remember or probably never knew.
Friends, romans, countrymen... et al, the Setting Up a Sitecore Extranet article I wrote in 2011 is one of my most trafficked. It occurred that many of you could benefit from the additional changes that I've made since then, so that those who are setting up your own system by hand could now benefit from a module that manages most of the process for you. For visual reference, I've made a video for a quick intro to the module.
There already exists an extranet module on the Sitecore Marketplace but I'm not the developer of it. Sitecore is. The documentation says it was created in 2007 for Sitecore 5.3. I've never used it so I can't speak to its efficacy. I'm presenting my own solution and you're free to choose which will work best for you.
In a recent Sitecore build I had to store the pages that a user saved as a "Favorite" throughout the site. The site was an intranet so everyone had a user within Sitecore, which helped. The next question was where to store the information. I wanted it to be stored along with local user data but wasn't sure if I was going to need to extend the user object and create extra fields or if I could leverage the existing structure. I ended up looking through a lot of the user properties and scouring the cookbooks and eventually I found what I was looking for in the security api cookbook: Custom Properties.