Check out his Redwald blog and become inspired by the detail and outstanding writing giving life to his vision of a Dark Ages RPG.
Currently he is writing it for Sword & Wizardry White Box, and if you email him, he might share the work in progress PDF's with you.
I am a big fan of the classic epics/sagas like Beowulf and the recent works of Bernard Cornwell's Saxon series of books as well as his take on a Dark Ages/historic King Arthur series The Warlord Chronicles. Haven't read them? Then you are in for a real treat! Better yet? Redwald nails the genre magnificently and adds nice detailed doses of the fantastic to keep things interesting.
100% honesty here, I absolutely love the Redwald setting and want to adapt to Heroes & Other Worlds as a setting book. The tactical nature of HOW lends itself easily to Lee's setting and the use of war-bands and other setting specifics could be easily and quickly handled by the HOW system. Lee has purchased a copy of HOW so we will see if the system appeals to him. On my own, I am converting Redwald material to HOW format for personal use, but who knows. Perhaps someday Redwald will become an Other World to explore.
In the same Dark ages sort of setting Geordie over at Bite the Bulette has the starting of a new adventure/dungeon which could be a great kick off for your own adventure. Checkout Geordie's work and see how this idea comes to life.