nerfherder
Explorer
Dont forget Imagine magazine as well.
And , more importantly, the non-TSR UK D&D contribution:
White Dwarf magazine: Tortured Souls: and the peerless Starstone module
I ran a Pelinore campaign for a couple of years, and really enjoyed it. IIRC we converted from AD&D to RQ3 part way through.
U1 stands out as being probably the most fun AD&D module I played in. But, our AD&D campaign was pretty much a Monty Haul affair when we played in the Slavers and Giants series.