well identifiers in a 1536-well mtp plate
and here's a scheme I made up myself:

AA01..AA48
..
AZ01..AZ48
BA01..BA48
..
BF01..BF48


Pros:


alphabetic sorting of well ids does what you expect
it's clear what's the row and what's the column
it's easy to distinguish well ids of 384-well plate from those of a 1536-well plate


Cons:


it's not used anywhere AFAIK