If the cost of Windows eating us your small business budget, make a wise business decision and move to Linux. From the PC World article:
Windows Vista debuted to muffled applause, followed by lackluster sales. Up until June 30, cash-strapped businesses looking to avoid the cost of upgrading to new Vista-compatible hardware could still purchase trusty Windows XP. Now, however, Windows XP is available only as a costly "downgrade" from Windows Vista--if you buy a copy of Vista, you can install the 6-year-old XP operating system using the Vista license.
If that feels like a waste of your small business's precious IT budget, and you're still looking for an alternative to Windows Vista, look no further than Linux.