I hit this thread when googling for a replacement for my rear Delgado rim that's cracking at 4 eyelets, and I felt my experiences are worth sharing. This is the second rear Delgado wheel that has cracked at the eyelets with < 4000 mi on it.
Wheel #1: 36h Delgado + LX hub on a Surly LHT. ~4000 miles, a mixture of commuting, grocery runs and loaded touring
Wheel #2: 32h Delgado + 105 hub on Salsa Casseroll. ~2200 miles, randonneuring and other unloaded riding

Both wheels were handbuilt (by different online sites) and their spoke tensions were checked out as okay by a LBS. The first wheel saw plenty of load and lots of rough gravel and pavement in its short life, so I consider its demise unfortunate but not tragic. I'm fairly ticked about the second wheel, since all it had to support was my fairly light behind (160) and 30 lbs of bike + gear.

As for replacements, I went with a 36h Dyad on the LHT which has been rock solid and will have my local builder lace up an Aerohead O/C for the Salsa this weekend. I'll also have to keep my fingers crossed that the two Delgado fronts hold up better, especially the one mated to my SON28.