auto-increment x,y fields with alphanumeric ID

[ErinRichmond]

I have a shapfile that contains a grid of points and I want to assign each point a unique alphanumeric ID so that latitude is the "alpha" part of the ID and longitude is the "numeric" part of the ID. Can anyone remind me how to do this using the field ArcGIS field calculator? Thanks!

[TedKowal]

Could you by chance wanting to create a Grid/Gradicule?  Sort of a map index?

[ErinRichmond]

Hi All - thanks for all the tips. I was able to do what I needed to do by using Excel.