Like Heather Solomon, I’m sometimes asked about styling individual web parts differently to the rest. I didn’t know of any way of doing this; instead, we’d typically style particular web part zones differently, but this meant that all web parts in that area looked differently.
Well, Heather has now posted ‘Controling single web parts with CSS‘. Neat. I didn’t know you could do that attribute selection.
The downer about this technique is that you have to set a DOCTYPE – and I can see that causing all sorts of grief as stuff breaks… …so it’s probably not something you’d do unless you’re building reasonably custom master page.