This update doesn't include the SD drivers (for SDHC support), it only includes xD, MS, and MMC. I found this to be true for my Vostro 1000. However, the driver update says it applies to:

Inspiron 1501
Inspiron 640m / E1405
Inspiron 9400/E1705
Inspiron 1420
Inspiron 1520
Inspiron 1521
Inspiron 1720
Inspiron 1721
Inspiron 6400/E1505R
Latitude D420
Latitude 131L
Dell Precision Mobile WorkStation M90
Vostro Notebook 1000
Vostro Notebook 1400
Vostro Notebook 1500
Vostro Notebook 1700
XPS M1210
XPS M1330
XPS/Inspiron M140/630m
XPS M1710
XPS M2010

This is quite an oversight on Dell's part. The only way I could get an updated SD driver was to download it from Ricoh. Here is some more information: Here.