Just got the message. Wow - where to begin !?
Have a look at the ABRG website ; -
http://www.back.to/arnhem
And then ( of course ! ) Sommecourt's website for links and information. As he correctly says, the recent two-volume 'Market-Garden: Then & Now' although not cheap, is sure to become a 'standard' work. There is an almost incredible number of books on this single battle - I have literally a complete shelf-full.
If asked to recommend just a couple which are easy to get, I'd certainly suggest 'Arnhem 1944 : The Airborne Battle' by Martin Middlebrook and 'The Devil's Birthday : The Bridges To Arnhem' by Geoffrey Powell ( the last one covers the whole operation, not just Arnhem/Oosterbeek ).
For the German side, Robert Kershaw's 'It Never Snows In September' is useful but has been criticised for errors of fact.
And for a view of 'what it was like', there is an extraordinary novelised account of 21 Independent Coy's experience in 'The Cauldron' by Zeno ( a pseudonym for No 2 Platoon Sgt Ken Allerton ). This is sadly hard to find which is a pity - it's one of the best books I know about fighting in NW Europe.
Arnhem is a big subject ( for a relatively small battle ! ) ; let us all know if there are particular areas you're focussing on.