After much dissection of the norms, he concludes:
Sadly, I think, bishops still have little idea what to do with deacons.
The idea of denying the Roman collar to men duly ordained as clerics, while permitting it for those merely studying for the priesthood, as is the case in many seminaries, doesn’t make sense to me.
A deacon is a deacon is a deacon.
You’ll want to read the whole thing.
UPDATE: If you visit Fr. Z’s link, scroll through some of the comments. There are some, um, interesting opinions. (I especially like the one from a reader who is shocked, simply shocked, that deacons engage in unbecoming activities like dancing!) Anyway…one who has just added his voice is Deacon Bill Ditewig. Drop by and see what he had to say.