Now that the dust has settled on this whole rumor issue, and we now know that there are several new add-ons in development for the Gamecube, what would everyone like to see? I've come up with a few ideas that I think might work, not only from a gameplay standpoint, but from a buisness standpoint as well. Some are more far-fetched than others, however...

1)
A Headset: With the rumors of new online-capable games swirling around (such as Splinter Cell 2), this seems like a possibility. Not only could a headset provide voice chat capability online, but voice recognition in single player games. This would
have to come as a pack-in with a killer app, but it's worked before (just look at the rumble pack that came with Starfox 64)
2)
Online Gameboy Games: While I'm not entirely sure on this, but from everything that I've read, the GBP can access all of the GC's internal hardware, including the modem/BBA. So wouldn't be a simple matter of releasing a new GBP disc that would allow the BBA to act as a substitue link cable? You'd have to have some sort of ISP seach function to find other players wanting to play the same game as you, but given the software that's out there (as well as new games that could be created), this might be
very popular. A side benefit: this could be a way to get a ton of GCs online - thus making online gaming more attractive to third parties. Pack the new GBP disc in with the BBA and you might have a winner.
3)
A Hard Drive: While I'm not so sure about the benefits of this, if they do want to push an online strategy, then a hard drive might be a nice addition.
4)
An Optical/Coax DD 5.1 output: I'm not certain if the bandwidth of the other Serial Port could handle this, but it would certaintly complement my nice, new component cables nicely.
So what would everyone like to see? While Nintendo has had many failed add-ons, they've had a few sucessful one, more than most other companies can claim!