Thanks Robert! I specifically read somewhere that the meta keywords were not recognized beyond the 155 characters, but there seems to be a lot of misinformation about keywords out there.
The link and the Matt Cutts posting clarify the issue nicely. For Yahoo and Bing I will still keep the meta keywords, though it's likely they ignore them as well.
I've kept the meta description in a format that looks sensible to viewers of the snippet, so I'm OK there.