I pretty much exclusively run touring tyres on my MTB. I've recently swapped from Vredestein Spiders which are nice fast 1.95 semi-slicks to Schwalbe Marathon Plus (1.7) which are very fast rolling, should be nigh on puncture proof but are heavy. I liked the plain Nimbus - it's an okay tyre but found the Armadillo version lacking suppleness and spring - okay on very smooth tarmac but on rough tarmac...
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Currently riding an MTB with a split personality - commuting, touring, riding for the sake of riding, on or off road :)