We haven't said much here yet about solar energy , but even in advance of such a discussion it seems worthwhile to mention a recent development on that front. Several companies have started leasing solar panels for residential use. This gets around one of the principal drawbacks to this kind of energy generation, the upfront cost. A roof-top system capable of providing a reasonable level of electricity to an average house can cost $20,000 or $30,000 or more. There are tax credits available from...