"Arnhem Lift" by Louis Hagen, written a few weeks after the battle.
This book gives the unique perspective of a young Jewish refugee from Potsdam, germany, who managed to escape to Britain with his family in 1938 and after a period of internment, through volunteering for the Royal Pioneer Corps, managed to get into the Glider Pilot Regiment. He was one of the first guys to arrive in Arnhem and one of the last to escape across the Rhine at Oosterbek.
Later, during the 70s, he met a German his own age, who was actually a young officer in the German headquarters in Oosterbek during the battle. The second part of the book describes the battle as seen by this officer.
"Men at Arnhem" by (IIRC) Tom Angus, the best thing I've read about the battle and essential reading on subject. I'd also recommend "With the Jocks" a subaltern's view of his time as a Rifle platoon commander with 4KOSB from some time after D-Day until the end of the War. It's not strictly about Normandy but a fascinating read nonetheless. Finally, and the name escapes me, but a book by a chap who'd been mortar platoon commander in a Bn. of the Hampshires from shortly after D Day onwards, and don't ignore anything by Sydney Jarey about his time with the SLI in Normandy either!
"It never snows in Sepember" is very good, as mentioned.
"The Devils Birthday" by Geoffrey Powel. More a general round up similar to "Bridge too far", but still good.
If ya feeling really **** retentive, try http://www.pegasusarchive.org/arnhem/frames.htm
Several units war diaries on here relating to whole Arnhem action, despite the detail thay are quite illuminating, specially if you have some maps for reference.
Quite a lot of detail for Normandy and Arnhem action in Peter Harclerodes` "Para! 50 years of the Parachute Regiment"
An excellent account of the Gunner contribution to Market Garden is "The Gunners at Arnhem" (1999 Spurwing Publishing, ISBN 0-9535754-0-3) by Peter Wilkinson MC. Far from being a stale Gunners only work its a really interesting and well written book by a participant in the fighting - thoroughly recommended.