While I've recently covered the Vapps HighSpeed Conferencing service, which takes full advantage of Skype's wideband codecs for fantastic audio quality, Vapps has also updated their High-Definition Conferencing Skype Extra.

This add-on permits Skype users to schedule ad-hoc conference calls, sending automated chat messages. It also permits you to schedule calls of up to 500 participants, either over email, or over Skype. It also appears and operates in Mandarin Chinese, French, German, Italian, Japanese, Portuguese, Spanish and Polish, in addition to English.

The HighSpeed Conferencing service starts at $25 a month per room for up to 10 participants and goes up to $200 a month per room for up to 500 participants. All conference rooms are unlimited usage on toll-access line, some 800 number minutes are provided, overage is charged at a per-minute rate.