Personally, I don't try to catalog UV markings, though I do use a UV light to check for them on occasion.
Other chippers may be more involved with UV's than me.

It can be helpful in trying to decide if 2 chips are variants, or from the same production run.
If one has UV and the other does not, or if materially different, it may indicate 2 variants ... but also may be a reorder.

The one set of UV's that I did collect are the different UV names on the Luxor $1 Chipcos.
They caused some excitement when discovered in 1993 as Luxor's first set of chips.
If you're not familiar with them, they are listed on the Chipguide at:

http://www.themogh.org/cg_chip2.php?id=NVLVLU

(Also discussed on the Chipology 101 slide show, posted on the ccgtcc.com website.)