As someone said, XP is a manual setup option, but really no worse, Trim makes little to no difference on most of the good drives around now, and Win 7 auto handling your SSD is completely incorrect.
Both my crucial drives and my previous Samsung, win 7 detected NONE of them as SSD's and I still had to manually disable defrag, superfetch and you can if you want disable prefetch though I'm not sure Win 7 does even if it detects the drive as an SSD.
Fundamental flaw as always with windows is it will usually detect SSD's automatically, you know, ones that were released before Win 7 install disc's got printed(mostly) and some after, but not all.
I bet theres a bunch of people who think their ssd is all setup perfectly and it isn't, and after you set it up perfectly, you'll probably see next to no difference.
THe ONLY thing you HAVE to do is align it correctly.
Check out the Anandtech C300 reviews, unaligned vs aligned and several key parts of the performance are completely different, while the sandforce drives didn't make a whole lot of difference. But its the one thing to get right, and very easy to do.
The lower end Crucial's aren't really worth the cash as read performance(or write, forget which) improves significantly with each bump in capacity while Sandforce/Indilinx drives aren't hugely different, some, but not nearly the drop you get from the C300's controller.
Also, put windows on it, 99% of the benefits from SSD's really need both windows and the pagefile on the SSD otherwise its largely a waste, not always, depends on the program, but 99% of situations you put the OS on the ssd then whatever else you can fit in the priority of how often you use something. 64gb sounds small these days, but when you whack all your video's, pictures, and most of your not particularly HDD taxing games on a normal HDD you find you don't actually need that much space.