Thanael
Explorer
Also
Fighter's Challenge II
Wizard's Challenge II
Thief's Challenge II: Beacon Point (Set on a pirate isle!)
Cleric's Challenge II
From OD&D:
MSOLO1 M1 Blizzard Pass
MSOLO2 M2 Maze of the Riddling Minotaur
BSOLO Ghost of Lion Castle
XSOLO Lathan's Gold
O1 The Gem and the Staff (Thief one-on-one)
O2 Blade of Vengeance(one on one)
Dungeon had a few 1E/2E solo adventures, too: Just search for "solo" here: Dungeon Magazine Index
(plus there's TOMB IT MAY CONCERN in Dungeon #22, a solo adventure for a paladin 4-6, in which he gains a mount.)
As for 3E:
Thievery 101: Joining the Watchers and
Thievery 101: The Periapt of Famidon are linked solo modules for a beginning Rogue.
The free pdf A thief among us is included in the second adventure above.
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