downloading entire weblogs?

I am not sure I fully understand this, the xml-button gives me a whole weblog in an XML format, right? What's an easy way to view this content once I've downloaded it? What I want to do is download some weblogs once a day onto my laptop, and then read them at my leisure. (For this it would be great if I could specify a date from which on I want all postings.) Is this possible?