I have to say that after installing Small Business Server 2003 Premium Edition, there were some rather undesired effects!
Good things:
Exchange with the POP3 connector is amazing. I now use PDAs, laptops and even the Media Center to check my emails depending on where I am in the house.
The ability to put reminders in to both my calendar and that of my wife's is also awesome. I know a lot of people think it sad that you have to send your own partner an invitation, but with us both working it really saves us hassle.
Now we have an internal address book where we keep all our friends addresses, etc. with their birthdays, etc. This is also excellent.
The use of personal folders mapped to a network drive is a real life saver, especially when using multiple computers around the house. My USB memory stick is almost redundant!
Your MP3 collection and playlists, which ever machine you use!
Best of all is the backup utility. All the mailboxes, profiles, mp3s, etc. are backed up nightly to an external disk system over the network!
Bad things:
After installing the PDF iFilter for WSS my wife discovered that all her recipies [mixture of text files, word docs and pdf files] are suddenly indexed for easy searching. My main servers disk space has disappeared! Over a 100 gig of RAID 5 gone!
Things I would like to see in any newer versions for the house and home would have to be VOIP, MSN Messengener integration, central virus protection for all attached appliances and a licensing pack for home users. I think that 5 users would be great, but also include 5 XP Pro licenses. It would be a sure way that homes could cut down on virus infections, etc.