For those who can't afford the popular Canon versions (or maybe you just don't want to pay those price), these two alternative 90mm and 70-200mm Tamron lenses have just arrived at B&H. The 90mm F/2.8 Macro with VC would be a similar style lens as the Canon 100mm F/2.8L IS Macro, but is about 25% cheaper.

Tamron 90mm F/2.8 Macro

Canon 100mm F/2.8L IS Macro Lens

The Tamron 70-200mm F/2.8 with VC is about $1000 dollars cheaper than the Canon 70-200mm F/2.8L IS. I use the Canon 70-200mm F/2.8 quite a bit in studio because i'm able to blur out backgrounds and narrow my field of view when shooting on 9ft backdrops. I sometimes find myself wanting a second 70-200mm lens for a second angle, and this new Tamron is looking like a good option.

Tamron 70-200mm F/2.8

Canon 70-200mm F/2.8L IS II