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Small business edition is Windows 2003 standard with Exchange, ISA Firewall, Sql Server, Sharepoint (depending on whether you buy premium or standard)
The differences between Standard, Enterprise and Datacenter really come down to the number of processors, amount of ram, and number of node in a cluster that each support. (Standard being the lowest, then Enterprise and finally Datacenter)
Here's a Link [microsoft.com] to the product family on MS.com.
I've personally installed a PDC on Standard.
Hope that helps. The docs aren't really that clear. I did the research a while ago in order to figure out the upgrade paths for our company. Web is great for web servers and utility servers (files, stuff like that) especially since it's like half the cost of the Standard.
-=casey=-