One of the frustrations of the Kik IM app is that it does not support Mango yet.
From their twitter account however we now know their Mango version has already been submitted, and is currently awaiting certification.
The mango update should bring improved performance and fast app switching, both of which will improve the user experience tremendously.
Kik have previously famously said that Windows Phone 7 users, despite their small numbers, exerted a significant halo effect, leading to an increase in their user numbers much out of proportion to the number of Windows Phone 7 users.
Thanks Simon for the tip.