Amsterdam-based e-messenger.net had the web chat market all to themselves before Meebo came along and stomped all over them, matching their traffic in four short months and raising venture capital from Sequoia.
Earlier this week e-messenger fired back with an ajax implementation of its own. At this time it only works for MSN IM. Implementation is via a pop-up, whereas Meebo places the chat box within the page. There are pros and cons to this approach. With e-messenger the popup looks and feels like a normal instant messenger client, although with Meebo the page can simply be resized to achieve the same effect.