Helpmōtung:On Englisce Ƿrītan
Keyboard for Mac OS X[adiht fruman]
Apologies for writing in Modern English, my OE studies are at an early stage. I noticed the Mac OS X keyboard layout file mentioned in the text, called Anglo-Saxon.keylayout, is unavailable from either of the links. I've made a keylayout file for my own use which I'm happy to share - http://www.benpaley.com/domains/benpaley.com/local/media/downloads/oldenglish.keylayout (no guarantees or warrantees etc).
It's based on the standard British keyboard layout, and includes ash, thorn, eth, yogh and wynn, dead keys for macrons and overdots, as well as the Tironian Et, thorn with a slash and a middot (some people use it to mark a cæsura I think). If anyone wants it, feel free - if anyone would like me to explain where everything is, I'll be happy to - and if I've missed any useful characters, let me know!
Forgot to mention, also an icon based on the current flag of Wessex: http://www.benpaley.com/domains/benpaley.com/local/media/downloads/oldenglish.icns