Canon EF 28-135mm f/3.5-5.6 IS USM ----------Okay I have this lens and use it when I want to go somewhere without the weight of my 24-70/2.8 L or the worry of breaking it. Look for a super sharp copy of this lens.
Nikon 105mm F/2.8 AF Macro Micro - This lens is great for shooting small details - mainly the rings - at weddings. This is pretty much the only time I bring it out, but totally worth it. Can make for a great portrait lens as well, but I tend to shoot more with the 85mm.