Heritage Books has the Calender of New Jersey Wills on CD for ca 1670 to 1760. It includes all NJ Wills that are available from the Archives, not just Monmouth Co.
Newly available from Heritage Books is "Monmouth County New Jersey Deeds Books A, B, C, & D". It includes deeds as well as other miscellaneous records, and covers the years 1669 to 1714.
My all time favorite resource is the 5 volume set of John E. Stillwell's "Historical Miscellany" which are available from Higginson Books. At a minimum you would want to have vol. 2 which contains early town records, such as earmarks, deeds, road surveys, etc., as well as cemetery inscriptions. Vol. 1 covers Staten Island and Shrewsbury. Vol.s 3-5 contain genealogies of several Monmouth Co. families, and includes absracts of deeds, wills, court and other sundry records related to those families.
"Old Times in Old Monmouth" by Edwin Salter and George Beekman (from Heritage) will give you a real flavor for life in Monmouth Co. before and during the Revolutionary War. If you are researching Dutch ancestors, then George Beekman's "Early Dutch Settlers of Monmouth County" is useful. This book is available from the Monmouth Co. Historical Society.