Interiour technologies.. where to find info?

I'm shopping for a mid-priced ($40-50k) vehicle and am as interested in the interiour technology as I am the performance and looks. For example I'm sure some have better mapping systems then others, and some have better built-in hands-free phones than others. I'm sure there are other interiour options I should be thinking about as well...

I came upon the need to find this source when I saw someone at the golf course get in his Mercedes and it spoke to him telling him that he missed 3 calls and that he had a voicemail waiting for him.. prompting me to think "that's neat..where can I get info on which cars do what?"...

So which car has the neatest technology options?

Where can I find a source of comparisons, info, reviews, etc of this type of thing?

Any help is greatly appreciated. Thanks!

craig