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Ok, I did a little reading on DLink's website and it appears the major differences between the two cards are the DCF-650W is a type II card only and it uses more power compared to the DCF-660W. I've included the specs from DLink below, I editted the info so the common specs are listed at the bottom, instead of having them listed twice.
Specifications for DCF-650W
Host interface
• Compact Flash V1.4, CF+ I/O interface, Type II
Supported OS
• Windows CE version 3.0
Power Consumption
• TX power consumption: <380mA
• RX power consumption: <280mA
• Sleep Mode power consumption: 170mA
Output Power
• 14 dBm (Max. 18dBm)
Voltage
• 3.3 VDC+-10%
Operating Channels
• 11 Canada (DOC)
Antenna
• 11Mbps < -80dBm
• 5.5Mbps < -83dBm
• 2 Mbps < -86dBm
• 1 Mbps < -88dBm
Physical Dimensions
• L = 3.25 inches
• W= 2.31 inches
• H= 0.44 inches
• Weight = 0.06 lbs
Specifications for DCF-660W
Standards
• Wi-Fi Compatible
Host interface
• Compact Flash V1.4, CF+ I/O interface, Type I & Type II compliant
Supported OS
• Windows CE version 3.0 / Pocket PC 2002
Power Consumption
• TX power consumption: <350mA
• RX power consumption: <250mA
• Sleep Mode power consumption: 17mA
Output Power
• 12 dBm
Voltage
• 3.3 VDC ± 5%
Antenna
• 11Mbps < -83dBm
• 5.5Mbps < -86dBm
• 2 Mbps < -89dBm
• 1 Mbps < -91dBm
Physical Dimensions
• L = 4.45 inches (113 mm)
• W= 2.13 inches (54 mm)
• H= 0.21 inches (5.3 mm)
• Weight = 0.04 lbs (<20g)
Common Specifications
Standards
• IEEE 802.11b
Protocols
• TCP/IP
Data Security
• 64/128-bit WEP (Wired Equivalent Privacy) Encryption
Data Rate & Modulation
• 11Mbps: CCK
• 5.5Mbps: CCK
• 2Mbps: DQPSK
• 1Mpbs: DBSK
• Auto Fall-Back
Range Coverage (Open Environment)
• 460 feet @ 11Mbps
• 656 feet @ 5.5Mbps
• 885 feet @ 2Mbps
• 1311 feet @ 1Mbps
Diagnostic LED
• Power, Link
Network Architecture Types
• Supports Ad-Hoc and Infrastructure, 802.11 Ad-Hoc
• Roaming (standard IEEE 802.11 compliant)
Operating Channels
• 11 United States (FCC)
Antenna
• PIFA (Patched Inverse “F” Antenna) Type Antenna
Sensitivity @ PER<0.08
Frequency Range
• 2.412-2.462 GHz, Direct Sequence Spread Spectrum (DSSS)
Temperature
• Operating Temperature 32º ~ 131ºF (0 ~ 55°C)
• Storage Temperature -4º ~ 176°F (-20 ~ 80 °C)
Humidity
• 5~90% Non-condensing
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