IM invisible by contact

[Tek34]

Is there and IM app that has the same functionality of the windows Yahoo! IM in that it can allow you to appear either online or invisible by a selected contact (i.e. so you can appear available to some people and offline/invisible) to others without modifying your contact lists or having to create multiple accounts?

I currently have meebo and mundu IM but I don't believe either has this ability.
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[Carl C]

I think ebuddy has the option to "Block" certain contacts , so you could block certan ones and that will make you appear as offline to them.

Hope this helps