"Ultimate" debuted at #61 last week; I don't know where it ranks in its second week. ??

"3121" debuted at #1 this year.

Any other years that he's had 2 albums chart?

Below are multiple entries in the album chart during the same year.

8/18/01 The Very Best Of Prince
12/8/01 The Rainbow Children

9/11/99 The Vault.. Old Friends For Sale
11/27/99 Rave Un2 The Joy Fantastic
2/20/99 1999:The New Master

3/14/98 Crystal Ball
7/18/98 Newpower Soul

4/06/96 Girl 6
7/27/96 Chaos And Disorder
12/7/96 Emancipation

9/3/94 Come
12/10/94 Black Album
6/4/94 Beautiful Experience

And finally the triple entry of 10/2/93 with:

The Hits/The B-Sides
The Hits 1
The Hits 2

Thats amazing it actually even charted! He really hasn't done anything for most of the year.