Listmania!
Books on writing comics
Understanding Comics: The Invisible ArtUnderstanding Comics: The Invisible Art by Scott McCloud
Buy new: £8.19 / Used from: £7.00
Simply classic. An explanation of what makes comics work, in comicbook form.
Reinventing ComicsReinventing Comics by Scott McCloud
Buy new: £10.17 / Used from: £6.30
The sequel. Not quite as helpful.
Comics and Sequential ArtComics and Sequential Art by Will Eisner
Buy used from: £8.89
Will Eisner covering similar ground to Understanding Comics. A bit more old school.
Writers on Comics ScriptwritingWriters on Comics Scriptwriting by Mark Salisbury
Buy new: £10.49 / Used from: £5.50
Interviews with Grant Morrison, Garth Ennis, Warren Ellis, Frank Miller, Neil Gaiman and others
Artists on Comics ArtArtists on Comics Art by Mark Salisbury
Buy new: £12.74 / Used from: £0.73
Interviews with Dave Gibbons, Steve Dillon, Brian Bolland, Dave McKean and others
How to Draw and Sell Comic StripsHow to Draw and Sell Comic Strips by Alan McKenzie
Buy used from: £0.01
A former 2000AD editor on the subject.
The Sandman: Dream CountryThe Sandman: Dream Country by Neil Gaiman
Buy new: £5.96 / Used from: £4.00
Includes an example of a Neil Gaiman script
The DC Comics Guide to Writing ComicsThe DC Comics Guide to Writing Comics by Dennis O'Neil
Buy new: £10.06 / Used from: £5.88
A good introduction, but doesn't go far
The Elements of StyleThe Elements of Style by William Strunk Jr.
Buy new: £5.60 / Used from: £0.96
The classic principles of english style
On WritingOn Writing by Stephen King
Buy used from: £2.76
About writing novels rather than comics, but a good read for any wannabe writer none-the-less
Danse MacabreDanse Macabre by Stephen King
Buy used from: £0.01
A good analysis of the Horror, SF and Fantasy genre, though a little dated
Adventures in the Screen TradeAdventures in the Screen Trade by William Goldman
Buy new: £7.09 / Used from: £3.28
The classic book on screenwriting