While this may appeal to people on some setups, hitpoints are usually less useful than increases to tanking the incoming damage. Hitpoint rigs will simply make you last 15% longer, while rigs that increase the damage per second you are tanking are likely to help you repair more than 15% more armour or shield over the course of a fight. In essence, repairing damage is like adding extra hitpoints during the fight and you're likely to add more than 15% of your total over the course of a fight, especially on unplated ships and Battleships.

For shields, of course, more hitpoints means more regeneration in hitpoints per second, so the hitpoint rig is still useful. Shield has a rig to reduce the powergrid of shield modules by 10% and another to reduce the capacitor use of shield boosters and remote shield transfers by 10%, while armour only has one that affects capacitor use of remote repair systems. On the plus side for armour users, the remote repair rig Remote Repair Augmentor I decreases the capacitor use of remote armour repairers by 20%, which stacks with the bonus on a logistics ship for some amazingly efficient repairing.

ELECTRONIC WARFARE
In addition to the above, we have electronic warfare rigs in the form of the Electronic Superiority group. These modify stats such as capacitor use and strength of ECM modules, sensor dampener strength, tracking disruptor effectiveness and target painter effectiveness.

With the recent nerf to ECM, the new ECM rigs will keep an EW player ahead of his game. In addition, there are electronic superiority rigs to increase lock distance by 20%, increase scan resolution by 20% (which has the effect of decreasing lock times), and to reduce the sensor recalibration delay after decloaking, the time in which you cannot target your enemy. Since capacitor, powergrid or weapons rigs are likely to be more useful on most setups, electronic warfare rigs are likely to be of very specialized, but effective use.

SPEEDFREAK
For those of you who can't get Eve Isk enough speed, there is a whole section of rigs just for you. The astronautics rigs do everything from simply giving your ship a 10% higher max velocity or 20% max warp speed, to increasing ship agility by 15%. There are rigs in this section to make your afterburners and microwarpdrives burn longer, use less capacitor and give you a larger speed boost. My personal favourite, however, is the Polycarbon Engine Housing. This rig decreases the mass of your ship by 15%, which has the effect of increasing agility markedly (although the exact percentage is unknown), and increasing the speed you get from microwarpdrives and afterburners. It's effectively two rigs in one, though it may yet be nerfed due to the current over prevalence of Battleships using inertial stabilisers and this rig to reduce their mass so much that they are as fast and agile as Interceptors.