Decent adblocker for Internet Explorer 9

[#1]

After being a long time-user of Firefox, for reasons of compatability with friends and having just moved from XP to Win 7 64-bit, I'm trying Internet Explorer 9.
Can anyone recommend a decent adblocker?
Quite a few on the 'net, but Firefox's was so good and free!
Regards.....

[#2]

Tracking protection on IE9 works well for me, See here......http://windows.microsoft.com/en-GB/internet-explorer/products/ie-9/features/tracking-protection

[#3]

I've always found modifying the hosts file to work a treat: http://winhelp2002.mvps.org/hosts.htm

[#4]

Many thanks Steve and Matt for your speedy and detailed responses.
Most grateful.
Regards.....Noel

[#5]

Or if you dont like editing the hosts file (i dont, unless theres something i *really* require blocking) - Try Peerblock
Benefit of this over hosts is you can see what is being blocked in real-time, and 'allow' it temporarily if required
(i use many lists from iblocklist to narrow down what can connect to a server i use)
Regards

[#6]

Many thanks, Matt_2k34
Regards....