Ti was the wonder material of the late 80's and 90's, and for sure it is expensive.
GT models the Xizang and Lightning for mtb and Edge Ti for road and then the Lynx was the LTS version that never made production.
Many companies made/make Ti bikes, Merlin, Litespeed, Dean, Nuke Proof, Moots, Mcmahon, GT, Mongoose, Serrota, Yeti, Fat Chance, Seven, IF, Raleigh, etc. Its more who didn't make a Ti frame in the past.
Not saying Ti is the lightest thing out there, I'm sure a brick of it will be more than Al, and not even in the same realm as stuff like magnesium or beryllium that they have tried to make bikes out of, but its way lighter than steel and in the grand scheme of things it comes in in like the top 20% of materials out there, so most stuff is heavier, so very heavy it isn't, just not as light as other stuff out there used for bikes. But when you actually make the bike, due to its strength, you can make smaller diameter tubes than say aluminium which have to be ultra thin to get the stiffness with the weight (vague basic frame building properties).
DOn't know if there is a similar thread here, so I'll just link to this one (page 16 shows the Lynx):http://forums.mtbr.com/vintage-retro-cl ... -2814.html
2003 Yeti ARC, 2008 GT Zaskar Reissue
, 2012 Cannondale Synapse 3 Carbon (broke), 1996 GT Xizang
2012 Cervelo R3, 2015 Look 675 Light, 2015 Scott Spark 710