Beginner

• Integrated Korean 1 & 2 (w/ audio)
• My Korean 1 & 2 + audio ( source: http://artsonline.monash.edu.au/korean/my-korean-1/ ) [These look the cutest to me LOL]
• Basic Korean
• Active Korean 1
• College Korean
• Korean Level 1 & 2 (Seoul Nat'l Uni Lang Edu Institute)
• Hanyang Korean 1 Grammar & Patterns (Looks useful as a reference..)
• Korean Grammar in Use Beginner (omg best book ever...)

Intermediate

• Using Korean: A Guide to Contemporary Usage
• Intermediate Korean
• Intermediate College Korean

Misc

• 2000 Essential Korean Words for Beginners (w/ audio)
• Easy to Learn Korean (these are cute..)
• Dirty Korean (lol)
• Making Out in Korean (lolol)
• Korean Idiomatic Expressions (TTMIK eBook I forgot I bought.......)