I replaced my 7200 rpm boot/program HDD with a 60 GB SSD about a month ago, it's an OCZ Agility series one.  (All my data is still on 500GB RAID 1 HDDs)   I've got Win 7 home premium, Aces High, Microsoft FSX,  Adobe PS CS4, Adobe Lightroom 2, and various small stuff like Speedfan and Winamp on it, and still have 15 GB free.
So far I love it.  Window 7 boots about 40% faster, Adobe Photoshop CS4 boots in about 3-4 seconds flat now, vs 10-15 seconds with my old disc.  Adobe Lightroom boots in about 4-5 seconds instead of 8-10 before, would be faster of course but it still has to load my catalog from another HDD.  
Aces High seems to load a bit faster, but it's not as drastic as other programs, maybe only 20% faster, I don't understand why it didn't make as big a difference with AH as other programs  

 .
Also it's tiny, draws less power, generates less heat, and is silent.  What's not to like? ... ... Oh yeah the price.   I got mine for $169 and am still waiting on a $20 rebate from OCZ.  But I'm very pleased with it so far.
If you have windows 7 and get a SSD that supports TRIM then you're already good to go
OK, what is this TRIM  you speak of and do I need it????  Does my OCZ Agility support it (whatever it is)???  Do I already have it????  
I just plugged my new OCZ SSD in, loaded Windows and programs on it, and it's been running swell for about 6 weeks now.  Is this TRIM some setting or something I need to do or worry about?  Will it make it go faster? Last longer?  I've never heard of this before.  

  EDUMACATE ME!!