Will the WiFly Shield from SparkFun labs be able to connect to a Bluetooth network?
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No, definitely not. It connects to WiFi (802.11a/b/g) networks, not Bluetooth (802.15.1).
I don't think an Arduino Bluetooth shield is available commercially today. Your best bet is to either buy an Arduino with Bluetooth integrated or figure out how to connect a USB or RS-232 Bluetooth adapter.
By the way, on behalf of electrical engineers, I apologize for this 802.11.15.1.a.b.g nonsense. Collectively, we're bad at some things, and naming protocols appears to be one of them.
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\$\begingroup\$ USB or RS-232 are bad suggestions. Simplest would be one with a TTL serial connection. Eg this one: sparkfun.com/commerce/product_info.php?products_id=9913 You can connect it directly to the UART pins on your microcontroller. RS-232 would require an interface chip, and USB would require a microcontroller with USB host, and lots and lots of complicated code to interface with it. \$\endgroup\$– davrCommented Jul 10, 2010 at 2:16