Just finishing my BSc in I.T. and have chosen to write my 8000 word project report on HSPA technology.
Wikipedia has a great section on the past/present and future surrounding technologies such as W-CDMA.
Here is a brief list of the pages I found useful on Wikipedia.
A great book by a couple of Nokia employees also adds some real technical material to the mix:
#15 Tolma Harri; Toskala Antii; (2006) HSDPA/HSUPA for UMTS – High Speed Radio Access for Mobile Communications, John Wiley & Sons Ltd, Wiltshire. [Available from Waterstones – priced ~£65.00 ISBN 0-470-01884-4]
I will be writing some more soon.