Dagger in specific low-level zone

Elwynn Forest:
Jeweled Dagger (item level 10)

Dun Morogh
Trogg Dagger (level 3)
Bloodstained Knife (level 9)

Tirisfal Glades
Deadman Dagger (level 3)
Small Green Dagger (level 10)

Loch Modan
Stonesplinter Dagger 13

Westfall
Talon of Vultros B 26
Brackclaw 19
Long Crawler Limb 15
Slicer Blade 17
Small Hand Blade 11

Silverpine
None

Redridge Mountain
Blackvenom Blade B 26
Giant Tarantula Fang 15

Duskwood
Naraxis' Fang 27
Hollowfang Blade 18
Venom Web Fang 19

Wetlands
None

Stormwind
None

Stranglethorn Vale
None

Arathi Highland
Shadow Hunter Knife 32

Alterac Mountain
Howling Blade B 36

Rogue Notable Weapons

Most are borrowed from Wowwiki.com:

Rogue Abilities
Thottbot Main-Hand Swords
Thottbot Off-Hand Swords
Warcraft's official site on Armor sets
WowWiki Rogue Armor Sets
WowWiki Rogue Armor with resists
Shadow Panther's Rogue Armor Spreadsheet
Wow-Loot's Armor while leveling