'Warwick Blogs' is the term that we use to refer to all the blogs and blog collections that we have at the University; it's the community of blogs at Warwick. http://blogs.warwick.ac.uk is the home page for Warwick Blogs.
'BlogBuilder' is the name of the tool that you use to create your blog, write entries, manage your blog and create galleries. It is the system behind your blog and Warwick Blogs, and was developed here at Warwick specifically to support personal web publishing.
There is also a blogs support web site (this one!) with lots of FAQs and useful information to help you.