There are several ad-blocking extensions for IE. a quick search on "ad block ie" turns up a few of them. Some of them use AdBlockPlus filter sets, so you can use the same filters you use in Firefox.
However, there's also IE's built-in Tracking Protection filter. While technically not intended first and foremost as an ad blocker, it does the job well enough. Several popular Tracking Protection Lists, or TPLs, are available. The maintainers of EasyList (probably the most popular ABP list) build their list as a TPL as well, and there are several others that are highly rated. TP isn't quite as feature-rish as a dedicated ad blocker - for example, it won't hide the space where the ad *would* have loaded, and while you can turn it off per-site, you can't turn it off per-element - but it's built in, fast, carries no risk of malware, and I believe it works in Metro mode (I wouldn't actually know; I have no use for such a crippled browser mode).
Win8/Windows RT projects:
List of desktop apps for hacked RT devices
Native Access WebServer and Libraries
WP8 Interop Unlocks
XapHandler, Root Webserver, OEM Marketplace XAPs, Bookmarklets collection (Find On Page), Interop-unlock hacks.