A bunch of other folks diaries, blogs, write-ups and so forth.

I like looking over other peoples shoulders online..

Facebook has a couple of useful groups,

https://www.facebook.com/groups/MedievalPewterersGuild/

Primarily a UK based group,

and the SCA Pewterers Guild

https://www.facebook.com/groups/370447152983758/

Darrell Markewitz' handy page with a focus on Viking Pewter,

http://www.warehamforge.ca/pewter.html

The Late and Very much Lamented Russ Gilman-Hunt's adventures in pewtering

https://conchoblog.wordpress.com/tag/pewter-casting/

Fernando Vigil's very handy beginners guide,

http://www.brighthelm.org/articles/pewtwer-casting

Guthrie Stewart has some interesting observations on various forms of Medieval Casting

https://medievalfoundry.wordpress.com/

the Madrone Pewterer's Guild

http://pewterersguild.org/

Jamie Hall's Wonderful look at medieval Jewellery technique

http://ganoksin.com/blog/primitive/