Nobody is telling you that you HAVE to update it. As i said somewhere earlier on the forums the updates are from Zukona. Windows 7 has yet to go live that is why your not seeing updates on WU. Aside from that the updates all have valid signatures from M$.
I had hopes for KB674103, but old apps still look like crap (read, "Anvil Studio" or "Flac Frontend", or basically anything that needs MSCOMCTL.OCX)
Pretty much sure that all Win7 updates with numbers prior to 9xxxxx are just test updates for testing how well updating process will work.