Two really excellent books on what is involved with blogging, both free, and very readable.
Seth Godwin’s is really good (a 26page pdf download for the paper junkies). Interestingly he has given up publishing ‘real’ books due to the inordinate time delays from writing to it getting on the shelves.
Also a great book (slightly more technical) from Reporters without borders called Handbook for bloggers and cyber-dissidents which is slightly more technical but still very good. This is the organisation that Julien Payne works for. Julien is appearing on Radio5 live this Sunday at 10.30 with Suw Charman, Saira Khan and myself!