solo'd (self only buffs) (pre GoD, lvl65):

some dragons (Western Wastes),
a guardian wurm (Skyfire Mountains),
some trash in (Plane of Tactics), (Crypt of Decay), (Plane of Earth), (Plane of Fire), (Halls of Honor),
Arena (Kael Drakkal), (Plane of Valor)
Zordakalicus Ragefire (Skyfire Mountains),
Gorenaire (Dreadlands). Mobs doing up to 200 dps.

solo'd (self only buffs) (2004, lvl70):

Lord Doljon (Velketor's Labyrinth).

solo'd (self only buffs) (2005, lvl70):

Discordling Enchainer (MPG (396 DPS)).
Aneuk Fleshthreader (Kod'Taz (421 DPS)).
Ikaav Captor (Kod'Taz (484 DPS)).

solo'd (self only buffs) (2006, lvl70):

Derakor the Vindicator (Kael Drakkal (425 DPS)) my DPS: 285.

Mob name (Zone (mob dps)).

Highest DPS on a raid: 510 DPS versus Tunat`Muram Cuu Vauax (fake)

--2 years EQ break--

solo'd (self only buffs) (2009, lvl85):

High Shaman Gangus (Loping Plains (1407 DPS)) my DPS: 581.
Ebontail (Hills of Shade).
King Tormax (Kael Drakkal) my DPS: 1197.
CoA Mini

Well, in 2010 you can solo everything that has no insane regen or a timer, as a cleric.
You can sustain 2k DPS over 10+min, burst (2min) over 4k DPS.
We 2 mercs healing you can even tank 6k hitter in T8 Underfoot zones.