More or less like Ash, I have an EEE PC 901, installed with VS2008 without SP1, Resharper and MSDN library. I didn't install SQL Server as I use MySQL most of the time. I install all my "important" tools, which is VS2008 on C:, the rest of the stuffs in D:, as I prefer to have maximum performance for my VS2008. Like the others had mentioned, screen size is quite a limiting factor, so I use ProFont at 8, shrinked the default window's UI, not forgetting to turn off the theme too.
Performance wise, CPU is doing ok, but the SSD read/write speed is a factor. I benchmarked and get around 30MB/s read, slightly more than 10MB/s write. When I try to load multiple apps, or when VS2008 is busy with something, it will take a much longer time to even load notepad, so I kinda practice to be patient and load 1 thing at a time (on my desktop, I can never wait to load everything in 1 shot). I had 2GB of RAM, had been trying to allocate more ram for disk cache, but still haven't achieve anything.
I used it to do onsite troubleshooting and minor touch up, or whenever I go outstation, plus watching my favourite CSI when I'm traveling :P. Anyway, the main reason I got this is because of it's battery runtime, 7 hours. I doubt you can find another decent notebook that can match it. It produce so little heat so it can play nice on my laps and the standby also quite seamless. I use the standby extensively and even leave it on standby for days. Battery only drop about 10% per day. I can be seated and working on my program and next minute close my notebook and move to the next location without worrying that it won't go into standby(even if it doesn't standby, it can still last until the next time it's opened up, and not burning the pouch along the way)
I did look into Acer AspireOne before I got the EEE PC, AspireOne did have a wider keyboard, much easier to type, but the touchpad and battery puts my off. I had been considering various 12" notebook too before decided on EEE PC, as I used to have a 12" for 4 years. But 12 incher doesn't have that much juice for me to work for more than 2 hours. Those that can run for 4 hours is just too pricey.
There's one time when I came into my client's office earlier then usual, in the morning at 9, started working on my notebook, left it on standby when I go for lunch, then worked until 5 in the evening, when everyone left, I still had 20% left on my battery. Knowing this, I can even leave the power adaptor in the hotel and just go around with a pouch. Way to go ASUS
EDIT: Sorry for the mis-information guys, I didn't realized that I only had VS2008 without SP1 on my Eee PC. Didn't realized the "difficulty" until Menelmacar as me about it.