Warning: These wiki pages have not been edited in years and may well be out of date/inaccurate. We recommend that you use them as a starting point for further investigation, rather than gospel.
Handy reference sheets, in PDF format, starting from Mason version 1.21:

0 [Mason 1.21 (pdf, 200 kB)]
0 [Mason 1.22 (pdf, 200 kB)] - new method: $m->has_content
0 [Mason 1.23 (pdf, 200 kB)] - new methods added to the FakeApache ($r) object when using the CGIHandler
0 1.24, 1.25, 1.26, 1.27, 1.28 - no interface changes
0 [Mason 1.31 (pdf, 177kB)] - Mason plugins, $m->clear_and_abort, several new config parameters

Error reports and suggestions for things to put in the remaining space will be gladly accepted by
dave at

-- DavidRBaird