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Soft Sound Spiral Trap Studio Foam Chocolate: - designed to improve sound quality within a studio or recording environment by reducing reverberation (echo). They are professional grade sound improvement products for use in commercial or home recording / listening settings. Soft Sound Studio Spiral Traps are designed to absorb sound from low to high frequencies and will improve the sound quality of any environment that suffers from poor acoustics. Available in a variety of sizes.

DIY sound proofing panels. They use these for a home recording studio, but I'm thinking they'd be good on any shared walls or ceiling in an apartment

DIY sound proofing panels - great for a home theater or recording studio.

Would be a good diffuser plus, cool artwork.

Rode Ixy. Capturing high-quality audio with your iPhone or iPad without additional equipment is pretty much impossible. If you need to record crisp video voiceover, classic quotes from your buffoon of a boss, or even organize blackmail that will stand up to courtroom scrutiny, this 24-bit stereo microphone designed specifically for your iPhone & iPad is what you’ll want. $199

Nice looking sound absorption for a home studio. 4x8 foam insulation boards from Home Depot covered in fabric = gorgeous DIY upholstered wall hangings... or put them together creating a cool headboard

Cascade Microphones Ribbon microphones

M-AUDIO - Luna II - Professional Large-Diaphragm Condenser Microphone

M-AUDIO - DMP3 - Dual Microphone/Instrument Preamp

:: Sterling Audio :: ST66

AMT M40 Piano Microphone System