A scientific look at label placement on forms
Wow, this is great. A user experience article backed up by real numbers! (And no, I don't think Jakob Nielsen's "buy the full report" teasers count.)
Matteo analyzed four different layouts of the same web form and discovered that users had the easiest time with a vertical form layout, with form labels above the fields.
This type of analysis is very useful, so I was hoping UXmatters had more of the same. Unfortunately, it seems the site is lacking more of that sort of writing. However, the introduction to color theory (part 2) was worth reading.