With the only of the PS3 being free, Steam coing to PS3 with the Portal 2 release, and a much more robust online offering.... I'd have to say the PS3... WIITH MARKETING ASIDE, is the best console option to date.
I have a 360. I hardly use the thing anymore. Too much good stuff coming out for Playstation.
Up to 2 to begin I believe. Then as you build a history you are offered 3 a month.
I have even gone as high as 4... but never go higher than the need for 2. It get's a little expensive going above 2 games a month in my personal opinion.
The only tracking is when GameFly says "shipped".
In the past they used to say "shipping out", but other than that you are not liable for anything in the shipping process. (I believe)
Just have your mail sent to a mailbox that you know is secure and accessible all days of the week and you will be fine.
I hope this helped.