Kevin over at CrackBerry has discovered by upgrading the original BlackBerry Pearl 8100 to OS 4.3.1, you get access to stereo Bluetooth (A2DP) on the device. He previously discovered that this upgrade on a Curve would enable video recording. Unfortunately OS 4.3.1 isn't available yet for the Pearl as it's still in beta.
He ended up pairing the Pearl 8100 with a pair of Motorola S9 stereo Bluetooth headphones and BluAnt Sonic Portable speakers. So hopefully we will see this new software upgrade come sometime soon.