Some Black Templars' fast attack choices are different from the ones in the Codex: Space Marines. Furthermore they play a slightly different role than in a regular space marine force

Black Templars Assualt Squad

Like all Black Templars' squad except for the command squad this unit cannot be upgraded with a veteran sergeant. But they can take up to two power weapons or power fist and the whole unit can be equipped with storm shields. Invulnerable saves for every single model in the squad! Now that's what I call a tough close combat unit. A very expensive one, true, but also very effective. An excellent addition to this unit is a chaplain with jump packs to add some extra punch. Five paladins per squad already form a strong unit with the chaplain, but if you can afford to take more in a larger game, take them. I would prefer power weapons and power fists over plasma pistols any day, but that's probably a matter of taste. Melter bombs are usually too expensive - use your power fists instead to take out vehicles.

Black Templars Bike Squadron

Another tough unit that can carry up to two power weapons. No power fists are allowd, so taking one melter is a viable option. The largest plus of this unit over a regular space marine bike squad are the neophytes though: You can have a nine men bike squadron with five paladins, three neophytes and a character on bike (preferably a chaplain). With their high toughness they are very durable and still have a lot of punch. 4th ed will make bikes even more powerfull, so don't let anyone tell you bikes aren't worth their points.

Attack Bike Squadron

Many people use them as a close combat unit due to their high toughness and armour save, but in my opinion that's a waste of points. For Black Templars this unit is an excellent option to get some fire support, which can also reinforce other units in close combat later in the game. While I prefer land speeders over attack bikes in 3rd ed, this might change with the new vehicle rules.

Land Speeders

The classic land speeder squadron is a very fast fire support unit. While most regular space marine armies use their land speeders to harrass their opponents and take up table quarters, they are real fire support units for Black Templars. Having no access to devastators and needing heavy support choices for land raider crusaders means that fire support has to be achieved otherwise. Against light infantry land speeders are excellent, and multi melters are extremely effective against vehicles. True, land speeders only have a very low armour, but they are highly mobile, enableing you to shift fire to almost any place you need it every turn.

The tornado and typhoon land speeder variants are very well armed, but cannot be taken in squadrons and are very expensive points wise. While I have made good experience with a typhoon, I don't recommend them: You only get one vehicle per fast attack choice and other units are more effective. In the first few games your opponent might underrate them and thus ignore them, giving them time to make up for their points, but soon enough you will find them crashing to the ground in turn one or two.