For the record... For [Artist]:
I go with Lastname, Firstname for all individual artists (Amos, Tori).
I go with Firstname Lastname if the artist has an associated "band" that they ALWAYS play with such that it is "the name of the band", not a person's name (Dave Matthews Band).
There's some stuff in the middle, of course. For example, Lavay Smith & Her Red Hot Skillet Lickers. Sometimes Lavay Smith plays with them, and sometimes solo. Béla Fleck is another good example.
In the vast majority of these cases, I file them under their individual name, and note the band name in another field (so it can be found by searching). If I ONLY have, and only expect to have, tracks from the band, and I think I'll probably "look for" them by that name, then I do the reverse.
My rules for [Composer] are easier: always Lastname ONLY (unless the composer only has one name, in which case I just fill that). kstuart convinced me of this method and I'm very happy he did. What I do is put the full name in another field (for searching) but my categories use the [Composer] tag, and that is all lastnames-only.
For [Actor] and [Director] and most other fields that might have a name, I do Firstname Lastname, because this:
If a tag is updated by an internet database it is almost all of the time First/Last.
If you go for Last/First you might have a nice uphill battle against the datbases
See also:
http://yabb.jriver.com/interact/index.php?topic=78210.msg532794#msg532794http://yabb.jriver.com/interact/index.php?topic=80231.5