Do you use more than one computer?

Many of us have more than 1 computer at home. We keep old ones and we may even have a mini museum of old PCs.

How many people regularly use more than 1 computer? I'm sure that most use a computer at work. Are you familiar with different operating systems? Windows XP? Vista? Mac OS? Linux? Laptop? Desktop?

Do you use a UMPC or tablet PC?

I've been thinking about how usage patterns have been evolving. People are using their PC to check e-mail, browse the web, chat on forums, socialize in social networking sites, and do their work. At what point does a person decide that "I need another PC in my life?"

Where is the UMPC market going?