Page titles are used as descriptors in (social) bookmarking. Consequently, a well formatted page title can speed up the process of finding a bookmark.

Here is the page title format that I find most effective to my bookmarking:
1. Page Name – Domain Name – Date
2. Page Name – Site Name – Date

I prefer domain name over site name, often because it’s usually shorter.
Date is only used when appropriate (blog, news, …). Ex: Dec 6, 2006