Just to say that I am not likely to be able to participate in voice/video conversations. I can try, but I am quite unsure about being able to have voice connection because of internet access quality. Nominally, it should work fine (ADSL 4Mbps/512Kbps), but the connection quality is not perfect, at least in the sense of skyping. Usually, I have a couple of interruptions during one 30-60 minutes session, which is OK if it is one-to-one communication, but could be very painful with many people in communication.
But, all in all, I don't have any strong argument against textual skyping. I don't know how WebEx would work on my computer, while it sounds interesting. And, of course, I prefer IRC.