I have two machines in regular use, a desktop and a laptop.

The laptop is a Thinkpad T41. It has a Pentium M process at 1.6ghz, 1gbyte memory, 60gbyte hard disk, running Win XP. Built in network, wireless, modem, 2 card slots, Radeon 7500. It's a pretty nice machine to hold, sturdy, thin, and very stiff. It replaced an Inspiron 3800, which was a 700mhz Pentium 3. I had repaired the Inspiron unit with a new keyboard and new screen hinge, and then the mouse and cooling plant were failing too. It was to the point of costing more to buy parts than to just buy a new laptop, even though realistically that old P3 was serving my mobile needs completely. I got the T41 used and with customer upgrades at a good price.

The desktop machine I just upgraded in autumn of last year, home grown from new parts. It's built around a Pentium Core2 Duo E8400 (3ghz). It has 4gbytes of memory, 500gbytes of disk, and a Geforce 9600, all running under Vista 64bit edition. I wish now that I had waited just a little longer and got on the i7 bandwagon, since the E8400 is the best processor that will work on the motherboard I've got. It's nice to have an upgrade path in mind. My motherboard and power supply are both branded to support SLI, so when 9600's get cheap as dirt that's one thing I'll do.