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Pulse Width Modulation Fans. 

Pulse Width Modulation (PWM) is a common technique for speed control which can overcome the problem of the poor starting performance of a motor.

PWM for motor speed control works in a very similar way.  Instead of supplying a varying voltage to a motor, it is supplied with a fixed voltage value (such as 12V) which starts it spinning immediately.  The voltage is then removed and the motor 'coasts'.  By continuing this voltage on/off cycle with a varying duty cycle, the motor speed can be controlled.
Evercool 40x15mm PWM fan with connector #EC4015SH12BP
Evercool 40x28mm 12V PWM fan with connector #F-EC4028HH12BP
Everflow 60x60x15mm Med Speed PWM Dual Ball Bearing 12 volt Fan #R126015BM
Evercool 70x25mm High Speed PWM Fan EC7025SH12BP
Cooler Master Blade Master 80mm PWM Fan R4-BM8S-30PK-R0 
Evercool 80x15mm 12V PWM fan with connector #EC8015HH12BP
Delta AFC0912D-AF00 92x25mm 12V 4pin PWM with Tac Sensor, Hi-speed
CoolerMaster Blade Master 92mm PWM Fan R4-BM9S-28PK-R0
Evercool 92x38mm High Speed PWM Fan EC9238H12BP
LEPA Vortex Frame 140 x 25mm Fan W/ PWM Controll #LPVX14P
LEPA Casino 4 Color LED 120 x 25mm Fan w/ PWM Control #LPVC1C12P-BL
BitFenix Spectre PRO PWM All White 120mm Fan BFF-SCF-P12025WW-RP
Cooler Master Blade Master 120mm PWM Fan R4-BMBS-20PK-R0
LEPA Casino Blue Spiral LED 120 x 25mm Fan w/ PWM Control #LPVC1C12P-BL
BitFenix Spectre PRO PWM All White 140mm Fan BFF-SCF-P14025WW-RP
BitFenix Spectre PRO PWM All Black 140mm Fan BFF-SCF-P14025KK-RP
LEPA Vortex Frame 120 x 25mm Fan W/ PWM Control #LPVX12P
Everflow 60X60X15mm Dual Ball Bearing Ultra High Speed PWM Fan # R126015BU
EVERFLOW 60X60X25mm Dual Ball Bearing PWM Fan F126025BU
Dynatron Top Motor 70 x15mm PWM fan # DF127015BU-PWMG
Everflow 80x80x25mm Dual Ball Bearing PWM Fan# R128025BU
Delta 80x15mm High Speed PWM Fan #EFC0812DB
Noctua 80mm Premium PWM Fan # NF-R8 PWM
Nexus 80 mm PWM Series Real Silent Case Fan SP802512H-03PWM
Evercool 80x38mm 12V PWM fan with connector #EC8038HH12BP
Scythe 92mm PWM fan #DFS922512M-PWM
Noctua 92mm Premium PWM Fan # NF-B9 PWM
Noctua NF-S12A PWM 120mm Premium Fan
Scythe Slip Stream 120 PWM & V.R. Selectable Fan #SY1225SL12HPVS
Noctua 120mm Premium PWM Fan # NF-P12 PWM
Arctic Cooling F12 Pro PWM 120mm Fan
Arctic Cooling ARCTIC F9 92mm PWM fan
Arctic Cooling ARCTIC F12 120mm PWM fan
Nexus 92 mm PWM Series Real Silent Case Fan DF1209SL-3PWM
Gelid WING 12 PL Silent 120mm PWM Fan with LED #FN-FW12BPL-18
Spire Air Force 120mm LED Fan - SP12025N7L4-B-PWM
Noctua Fan NF-F12 PWM Fan with Focused Flow SO2 Bearing
Nexus 120mm PWM Series Real Silent Case Fan D12SL-12 PWM
Rexflo 80mm, 92mm and 120mm PWM fan w/ RPM Sensor
PWM Y Cable #FC444PWM-12BKS
4pin PWM male to 4pin PWM female extension cable w/ black sleeved Model FC44PWM-12BKS
Spire Circular 95x95x25mm 12V PWM Fan #SF09025SBH4W2-PWM
Sunbeam Reheosmart PCI Fan Controller # PL-RS-PCI
Evercool Fan Cable Adapter Supports 5 PWM Fans from single MB Header CB-EC-DF001
Evercool PWM Cable Supports 3 Fans from Single Header EC DF002
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