From BlenderWiki

[edit] Where can I find the subsurf button?

There's no subsurf button anymore. It is a modifier instead. See http://mediawiki.blender.org/index.php/Manual/Subsurf.

[edit] Where can I find LSCM unwrapping method?

Use "Unwrap" found in U key menu while in UV Face Select Mode. This will unwrap the mesh by using ABF method by default. If you want to use LSCM instead, go to Buttons Window\Editing\UV Calculation and change Angle Based to Conformal. The reason why ABF is default is because it is generally better than LSCM. There may be some exceptions for that though.