Coolio. I've got some more stuff for you:
JQ Assassin Quest
Author: Jannix Quinn
Current Version: 1
Version Date: 4 Jun 2008
Links: http://planetelderscrolls.gamespy.com/View.php?view=oblivionmods.detail&id=4514
Requirements: n/a
Starting from Luther Broad's Boarding House in the IC, you'll find a note left by a stranger which asks you to kill a specific person. Should you decide to go through with the request, you'll be handsomely rewarded, and presented another victim. The assassinations get harder, and the rewards for success are great. But beware, for if you are spotted killing an innocent by the officers of the law, they will show you no mercy!
This mod contains a number of assassination targets, and various rewards that start out small and get much larger. There are several custom items and trophies for you to decorate your houses with, and some of the targets are quite challenging.
NNW's Ayleid Ruins Expanded
Author: Lady Rowena and NNW
Current Version: 3.0
Version Date: 21 Jun 2011
Links: http://tes.nexusmods.com/downloads/file.php?id=23384
Requirements: n/a
A very long time ago, an artifact filled with stored knowledge was hidden by the Ayleids in an unspecified Ayleid ruin, together with lots of gold, welkynd stones and other useful things. Approximately 80 years ago, an Imperial Army troop stumbled across a strange artifact in a ruin of completely strange architectural style - partly Ayleid, partly completely unique. Since they didn't know anything about it they simply let it disappear into the Emperor's vault...
This mod leads you on a quest through several new and existing Ayleid ruins in search of a lost artifact. The second series leads you on another quest for another artifact. These quests are designed for high-level players - L25+.
Reclaim Sancre Tor
Author: DarkRider
Current Version: 1.0.4
Version Date: 2 Dec 2011
Links: http://tesalliance.org/forums/index.php?/files/file/951-reclaiming-sancre-tor/ | http://www.tesnexus.com/downloads/file.php?id=40757 | http://www.reclaimsancretor.com/
Requirements: n/a
Reclaiming Sancre Tor is an in-depth Story based expansion pack that adds hundreds of new characters, overlapping quests, new worlds, and multiple unique dungeon levels to the original Elder Scrolls IV: Oblivion RPG by Bethesda Softworks. The Story surrounds a contingent of Blades from Morrowind who have reclaimed the ancient ruins of Sancre Tor in the aftermath of the Oblivion crisis. The player is invited to join their ranks and must aid the Blades in serving the Empire as well as unraveling their own destiny.
A Brotherhood Renewed
Author: Arthmoor
Current Version: 1.1.1
Version Date: 4 Nov 2011
Links: http://tes.nexusmods.com/downloads/file.php?id=31773 | http://tesalliance.org/forums/index.php?/files/file/422-a-brotherhood-renewed/ | French: http://www.confrerie-des-traducteurs.fr/site/mods/guildes_et_quetes/a_brotherhood_renewed.php
Requirements: n/a
This mod adds a short series of quests to the end of the saga of the Dark Brotherhood which takes place after your first visit to Bravil after becoming the Listener. I always felt that Bethesda cut things short at the end of the quest line. You're just supposed to continue on, as though nothing was wrong, after your entire organization was brought to its knees? What about all those sanctuaries out there the game makes a point of mentioning but you never see? This is my answer to that and at least brings things to a more sensible close by the time you are done.
All the descriptions are from the readmes; I was going to write my own, but I just suffered a huge brainfart. The readme versions are good enough anyway.
Assassin Quest I'd classify as Medium; there are a lot of contracts, but they're all more or less "go here and kill this person" or "find this person, then kill him/her" - there aren't any silly "I need to find the macguffin so I can kill such-and-so" quests.
NNWARE is also Medium; it mostly involves following clues through various ruins to find an artifact.
Reclaim Sancre Tor.... wow, I'm surprised that one isn't on the list already.
Not sure about Brotherhood Renewed - haven't played it yet.
Oh, if you need info for some of the stuff that hasn't been fully vetted, I'll be happy to help out.