Yeah, Microsoft Sam really isn't very good, and I don't like using with FS2, but there are other voices available, I think there may be some commercial products, and Vista and Windows 7 come with Microsoft Anna. She's still far from perfect, but I like her well enough to use her sometimes. There are some campaigns where you just can't take your eyes off the action long enough to read every line. Sure, you can read it in F4, but sometimes I miss stuff anyway.
I can't remember how I acquired it, but I have Microsoft Anna on XP. I know I have Microsoft Speech SDK 5.1 installed (press the Get Additional Voices button in the launcher, or click
here), but I'm not sure that's where I got it.
Also, if you don't think Sam is cool, have him say "My ROFLCopter goes soi soi soi soi"