Not a link but you can get a nice adapter from verizon for $9.99. Have them order the "shs25-35." Don't let them give you anything else. I tried 4 different ones and none worked before this one. They even ship 2 day fedex to your door for free. I wish sprint (my carrier) could get a clue when it comes to servicw like this.
Posted from my CrackBerry at wapforums.crackberry.com
Check out the Just Wireless 3.5 to 2.5 stereo headset adapter.
I use it with my 8830 in my car to convert from the 2.5 to 3.5, then I use a standard double-male 3.5 cable to my aux jack in my car. I can listen to Slacker, then answer calls when they come in, hang up, and Slacker comes right back on. Its great! There IS a little cross-over impedance noise between songs but music is flawless and so is phone usage.