The ISDN debate continues, with people declaring it's death every other month or so. Where I am in Chicago, ISDN lines are very expensive, over $200 a month, and that's even if you're not using it! I actually bought a nice used ISDN box a couple of years ago and never ended up hooking up the service - I just don't have a need for it.
So - I've kept my eye on other alternatives, primarily SourceConnect. I've heard good things and bad things about SC, everything from "it's a perfect solution," to "NEVER use this product." Why the disparity? It seems sheer bandwith speed has a lot to do with it, which shouldn't be a problem for me as evidenced by the picture below :)
Enter SoundStreak - a program/solution that has been getting a lot of press lately. They released a Windows version recently so have popped up on radars again. Unlike ISDN and SourceConnect - your voice is not recorded in real time to their system, but rather saved on your system and uploaded when the cilent chooses. I came across two videos showing a bit of the back end, and this EWABs episode features Beau Weaver explaining his take on it (about 33 minutes in).
If you're recording to video - I can see the value in this, but otherwise, I can do the same thing with a Skype phone patch and an FTP program. I hope to purchase SourceConnect eventually, but it's hard to make the jump without the need! :)