This might be one of the better items for a Roots Radicals Wiki Style FAQ: parepidemos aka Nic nicely put his photos up: his solution included help from his local bike shop, see here: http://xtracycle.com/forums/viewtopic.php?p=470&highlight=#470
This is the best looking non-commercial solution I've seen so far but as they say YMMV. The piccolo is not being made anymore (Burley almost went under), so they are somewhat of a previous commoddity now.. if anyone within the community has one that they're not using anymore, I think it might be a cool thing to pass it on to other members of the Roots Radicals... lending or "Pay it forward" type thing... Just found one in Berkeley on craigslist.. they want 220 for it, but we'll see.
Since Burley went out of business, no one has stepped up to the plate with anything as BURLEY as the Piccolo. The seatpost mounted trail a bikes just sketch me out in general, and you can't run them well on a X-bike... unless someone's got something tricky that they haven't shared.