Its actually a lovely OS if you take about a half an hour to install a few essentials and kill some of the unnecessary stuff.
I’m running Vista on my Dell M1330 (4GB Ram). I also run Firefox, thunderbird, google desktop, do loads of development using NetBeans and Visual Studio, the DX SDK, XNA, PHP, MySQL.
I have killed Windows Indexing and Windows Defender which are unnecessary resource hogs.
I have yet to have a bad experience with this setup. Everything starts practically instantly, the OS boots in aboout 10 seconds.
Vista I love you!!