I came across few useful links to blogs which anyone writing a thesis would find useful. They are
Also have a look at Pat Thompson’s blog. There’s lots of stuff on there (besides the two linked to above).
This isn’t specifically on writing up your thesis but is useful advice nevertheless. How to juggle a full-time job and a part-time PhD?
This is not on thesis writing but on PhD supervision. I thought I’d include it here as it seemed very relevant. Of monsters and mentors: PhD disasters and how to avoid them
PhD. Stuck points by Pat Thompson
10 ways to ensure you write a good PhD thesis by Peter Bickerton