The PHB and DMG have little to say on the subject of class skills, other than that you select your trained skills from the appropriate list of class skills at character creation and/or when selecting a multiclass feat.
Are there any other instances in which class skills are distinguished from non-class skills - eg, do players get a 1/2 level bonus to ALL skills?
This seems a bit counterintuitive to me, coming from 3.5E. For example, I would expect a high level rogue to be significantly more acrobatic than a high level cleric, assuming both were trained and were similarly dextrous.
Are there any other instances in which class skills are distinguished from non-class skills - eg, do players get a 1/2 level bonus to ALL skills?
This seems a bit counterintuitive to me, coming from 3.5E. For example, I would expect a high level rogue to be significantly more acrobatic than a high level cleric, assuming both were trained and were similarly dextrous.