Taking Battle To The Enemy
Kill 15 Cult of the Damned Members
This daily requires you to kill 15 Cult of the Damned Members. The easiest and closest location you can find these members is just south of the Argent Tournament Grounds at Sindragosa's Fall. However the Cult Members can be found almost all over Icecrown in many different areas.
This daily is the easiest of the 3 dailies available to you that awards Champion's Seals. If you're exceptionally lazy, like myself I still highly recommend doing this daily.
Battle Before the Citadel
Kill 3 Boneguard Commanders
Boneguard Commanders can be found around Corp'Rethar, in the same area you do your "At the Enemy's Gates" quest. The Boneguard Commanders are as powerful as the Champions that you fight for your other dailies. You can, however have friends to help you with this daily.
This daily is often combined with the Threat of the Citadel daily. There are always people in Icecrown looking for a group for these two dailies.
Among the Champions
Bring 4 Marks of the Champion to Illyrie Nightfall
In order to get a Mark of the Champion you will need to defeat a Champion at the Argent Tournament Grounds. The Champions can be found at the large "fighting area" at the southern part of the Argent Tournament Grounds.
Beware, the champions are tough and you'll need to really need to know what you're doing in order to defeat one of them. Chances are by now, you'll know what you're doing enough for the champions to be easy.