There are some system fixes in those updates but they are mostly related to Admin and server issues. The important updates are Security!!!!!!!!!! last year alone, Microsoft had to deal with over 5000 sercurity threats and fixes!!! Just get the updates and practice safe interneting (no condoms required).
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.