If you would like to try MInt, I would suggest Mint 5 since it is stable. Also, there will be (from my very limited understanding) an upgrade option from stable Mint 5 to stable Mint 6 (when stable Mint 6 comes out) As far as I have read it is best to upgrade from stable version so this is what I would recommend. Be sure and read the information about partitioning your harddrive so that you don't lost any of your personal files in the upgrade. It's in the post in this forum titled "things to consider before installation" or something quite similar.
As per your question regarding backporting, I admit I know very little about this. Hopefully someone with more knowledge will be able to come along and assist you in that area.
Best regards and welcome to Mint. I've been here about 3 months and used Ubuntu for about 2-3 weeks prior. Mint is just the better choice for me. I hope you will find it to be a great choice for you as well
Be kind- edit your post topics to show they are solved and thank the people who helped.
"Microsoft asks us to imagine a world with no walls. Well then why would we need Windows?"