OK, I'm gonna veer off topic a little...
I have a Samsung PB-22J in my UL30A, but it's only temporary. It's not the best by a long shot, but you don't need top of the range SSD to see a massive improvement in comfort.
What you get with a SSD is not raw performance, but responsiveness. Win 7 loads under 20 seconds, applications are very snappy and responsive, coming out of standby is very quick, shutdowns are under 3 seconds. It's great for a netbook / notebook where you'll be using it sporadically, and you can switch on and off real quick, and do light work. Plus, it's a little less load on batteries, completely silent, no heat, and much more resilient to damage than hard drives.
IMO, hard drives are the bottlenecks in any computer, no matter how fast or slow the CPU is. Personally, I think it's money well spent. For a netbook / notebook, I can see a 60GB under £100 being a viable option. And hopefully, they'll come down in price (however, everyone's been saying that for a few years now).
They are great as system drives for desktops too. I've been using a Raptor 30GB for quite a while, a SSD is a natural replacement. It's a great upgrade, and one everyone should consider, alongside a CPU and GPU upgrade. Now I just need to pull my fingers out and finally install win 7 on the Vertex