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A couple of suggestions...

GroffTips - examples of non-obvious solutions to various problems.

GroffExtras - macros, scripts, and utilities that are not part of the standard groff distribution.

Additional books on troff:

Narain Gehani, Document Formatting and Typesetting on the UNIX System, Summit (NJ): Silicon Press, 1986. ISBN: 0 9615336 0 9

Sandra L. Emerson and Karen Paulsell, troff Typesetting for UNIX Systems, Englewood Cliffs (NJ): Prentice-Hall, 1987. ISBN: 0 13 930959 4

Henry McGilton? and May McNabb?, Typesetting Tables on the UNIX System, Los Altos (CA): Trilithon Press, 1990. ISBN: 0 9626289 0 5

Eroff Desktop Typesetting System, Palo Alto (CA): Elan Computer Group, 1987.

Murray C. Malone, MM Macros: User's Guide and Reference, Toronto, Canada: SoftQuad?, 1988. ISBN: 0 88910 353 4

Manas Laha: An Introduction to the GNU Groff Text Processing System, 2003, online available at http://www.angelfire.com/linux/mlaha/pdffiles/grofftut.pdf