An often overlooked ultraportable
I have the D400 which I purchased about 6 months ago and it has been a wonderful laptop for many purposes. The screen is absolutely fantastic, bright and very sharp. A resolution of 1024 X 768 is perfect on a 12" screen. The keyboard has a great feel. It is a little smaller than a full size keyboard but does not feel cramped at all. It runs very cool and quiet. The location of the dedicated volume, mute and power buttons just above the keyboard is excellent. The location and feel of the pointing stick and the left and right click buttons for it are perfect for laptop use. It has an excellent selection of useful ports and connection devices as well. There are 3 USB 2.0 ports (one which shares the powered D-bay connector function), firewire, VGA out, 9 pin serial port, a single PCMCIA slot, RJ-11 modem, RJ-45 gigabit network, infrared and a lock slot. Another great thing about Dell is that finding and downloading and installing the drivers for the various hardware featues is very easy and straightforward. The best thing is the form factor. It is very comfortable in my lap even using it for a long time. I generally get about 4 hours out of each battery, so betwen the two batteries I have an easy 8 hours plus battery life. For an ultraportable I don't think you could do much better. I was very fortunate to have picked mine up through their outlet as a refurb with an extra battery, 1.4 Pentium M processor, a 40gb 5400 RPM drive, 512mb memory and te external DVD drive at a good price.
I took it with me to Hawaii on vacation and it handled e-mail, photoshop, music and movie playing and ripping and video transfer and editing very handily. It is the perrfect size and weight to take just about anyhwhere. However, I personally do wish it had an integrated optical drive. I am forever installing software, ripping music CDs, burning DVDs, backing up data etc. So for me an integrated optical drive would be very nice. I have looked at the Fujitsu S series for this purpose but they seem very expensive for the feature set. I am so pleased with the D400 I think I will stick with it for an ultraportable. I have an external firewire DVD/CDRW so I can at least burn CDs if needed. The only drawback is that it needs a seperate power supply. I also went ahead and ordered a Fujitsu E8010d so I will have a full size for daily use with all the bells and whistles.
Oh, and by the way, I don't care for the widescreen formator the various reflective screen technologies, thus my preference for my D400 over some of the other choices. The Fujitsu S7000 series looks really nice as well.
Good luck on your quest.