Tanks and Tankery

[Concillian]

Then again if you do a 5 point critical evisc you're going to get aggro, and there's not much a tank can do to stop that (or you for that matter).  So, just hold off for a little after the evisc and let them grab the aggro back.  If you have feint, use it.  Otherwise just refrain from ss x5 evisc for like 5 seconds until the mob is glued back to the tank.
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1) Eviscerate often does less damage than Rupture (especially if you're using Imp. Rupture) on high level elites simply because Rupture ignores defense. Also the damage from rupture happens over time, which can help a lot with keeping aggro off you.

2) Similarly, Garrotte can do more damage than Ambush as an opener. DoT is very useful for keeping aggro off you. Not only will you build aggro in smaller chunks, allowing your tank a chance to gain aggro at an equal pace, but your feint will actually work when you want to lose aggro, since you haven't outdistanced your tank by much.

3) Use Kidney shot occasionally to help your priest with mana, keeping you useful without pulling mana.

4) Use Feint. Too many rogues ignore the value of feint.

Really with feint you shouldn't have a huge problem with pulling aggro unless your tank is really bad at keeping it. Learn when your tank sucks and when you are doing too much burst DPS. Don't be afraid to tell a tank that sucks that he does. More often than not, the guy will have nothing in protection and/or isn't using defensive stance/Seal of Fury.

As has been said, Rogues cannot tank period. If for no other reason than they will be a huge mana-suck on the healer, as a properly speced (at least somewhat defensive) warrior or paladin has at least 3x the armor rating of a rogue. Generally a good shield at any level has approximately the same amount of armor as an equivalet full suit of leather armor, boots, gloves, etc...

Rogues are very effective in instances. Improved Sap is nearly a must though. You WILL be turned away from parties without Improved Sap. And there are VERY effective rogue builds that spend VERY few points in the Combat tree. With a build that gets Preparation and Improved CS out of the subtlety tree and Cold Blood from the Assassination tree, you have a rogue that is very effective in solo, instance, and PvP play. Also Hemorrgage is pretty useful as it is the cheapest attack that gains a combo point AND allows your tank to deal more damage = more aggro for him.

The problem with rogues in instances is often the player and not the class. Too many people play the same as 1 on 1 PvE, and that is just detrimenal to the party. Too often these are people spec'ed out to be a one-trick pony, and they get pissed at you when you tell them they aren't a good party fit. Properly spec'ed and played rogues are a HUGE boon to a party, but too many rogues out there are speced ONLY for solo play.