A few years ago having lifetime warranty on forks would be impossible. But the forks have been developed to a point where they're strong enough to give that kind of service to the customers. United recently released the Squad 2009 V2 Fork which has a 7075 Top Cap, custome fluted & butted tubing on the legs and new for 2009 are a built-in headset race on the re-designed steerer

tube and ultra tapered legs. The drop-outs now have inner machining going on to bring the weight down to only 926 grams (or 2 LBS if you prefer that). They come with 10 mm or 14 mm slots so for those still rocking the big axles up front you can get yourself a pair of those
Nathan Williams endorsed forks as well. But there is more to it. The forks received a rust proof coating before painting and when they chose the color they picked black and aqua but a few limited edition colours are on the way. Add full UV1 Heat treating to the product and you know you'll have something good. If it wasn't good, they would not give a lifetime warranty, would they.
United Bike Co