This is the bike that takes me to work and back every day, 38 km round-trip.
Half of it on pavement, the other half on gravel roads and even a couple of km on singletrack.
Changes and additions to the stock bike:
Wheels - I got a killer deal on a pair of Crank Brothers Cobalt 29er. I've kept the original wheels as my winter set with studded tires on.
Saddle and pedals - transferred from my old commuter.
Chainguard - Mostly to keep the chain free from snow spraying from the rear wheel in winter. Snow that otherwise would find its way to the derailleurs and clog them up.
Bar-ends - Topeak Bar’n Mirror
Lights - Dinotte 1200+ in front and a Dinotte 140L tail-light
Mud flaps - NOS from the 70's that I found on eBay.
I love this bell
Fenders and rack are Scott's "Urban Kit". The rack is made by Topeak and is MTX compatible.

Many think that the rack sitting directly on the fender with no other support looks flimsy, but the looks are deceiving.
The fenders are made of box-section aluminum and the fender stays are L-profile fiberglass composite.
That adds up to a super-stiff assembly. I have ridden the bike with 20 kg (45 lbs) on the rack and it doesn't move at all.