[eggy]

I program in J and there are many books, examples, YouTube videos, a great help file, and several active forums. Just check jsoftware.com.

Rosettacode is also a good source for example J code [1].

The J for C Programmers book is good if you already have programming experience, especially in C [2].

[1] http://rosettacode.org/wiki/Category:J

[2] http://www.jsoftware.com/help/jforc/contents.htm