My guess is that most people will soon find out that constantly being interrupted by one's cell phone makes it hard to relax or concentrate. On the other hand, it is convenient if someone is easy to reach.

Generics allow parameters to determine the type of the return value. This can be used to avoid a cast when returning objects from an internal map, by using the class of the object as a key.

The UMBC Semantic Web Reference Card is a handy "cheat sheet" for semantic web developers and programmers. It can be printed double sided on one sheet of paper and tri-folded. The card lists common RDF/RDFS/OWL classes and properties, popular namespaces and terms, XML datatypes, reserved terms, grammars and examples for encodings, etc.