aircables

Suppose you want wireless digital IO with a range of perhaps 100M...

This UK product apparently includes servo-control, digital IO, and serial communications
A complete wireless
control solution https://www.totalrobots.com/access_files/wcm.htm#ircm


If you're using a Stamp...


IR Buddy Pair Price: $49.00
or

Parallax 433 MHz RF Transceiver Package - BACKORDERED
[Larger image] Stock#: 28180 Category: Accessories-RF
Parallax 433 MHz RF Transceiver Package - BACKORDERED
Price: $109.00
Weight: 0.4 lb.

DESCRIPTION:
Expected to Ship: 05/05/06
New for 2006! Parallax produces our own RF modules from products made by the wireless module leader, Linx Technologies. The Parallax RF modules provide a very easy and low-cost method of sending data between microcontrollers or to a PC from 500 ft+ line-of-sight (depending on conditions). This transceiver package comes with two receivers and two transmitters, everything you need for bi-directional communication!

Downloads:
433 mHz Parallax RF Transmitter Manual (.pdf)
433 mHz Parallax RF Receiver Manual (.pdf)

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replacing a USB cable ...

Our AIRcable Industrial with a longer 9dBi antenna can do that.
See: http://www.aircable.net/industrial-male.html
and http://www.aircable.net/support-antenna-range-calc.html
Use a class 1 Bluetooth dongle on the PC.


If bridging a serial connection...
Radio / Wireless

ERKIT-900TS+RS http://www.saelig.com/miva/merchant.mvc?Screen=PROD&Product_Code=RW013&Category_Code=RW

ER900TS + RS EVALUATION KIT - 900Mhz

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and then there's gumstix with cfstix and wifi (or something, its hard to tell)
http://list.dprg.org/archive/2005-May/027769.html