The last year we have been working full time on JBoss Tools and JBoss Developer Studio. One of the challenges we had were to add support for JBoss Seam in Eclipse. Similar to what the Seam team did for the underlying frameworks (JSF, EJB3, JPA, etc.) we had to do integrate/adjust for the various plugins that exists in the Eclipse family (WTP, JSF, Dali, etc.).
I learnt a lot about JBoss Tools whilst writing a quick demo for my talk at Javapolis, and I wanted share a favourite feature with you - hot deploy of Seam components. Now, of course, this works with any seam problems if you set it up right, but JBoss Tools makes it /seamless/ :-). It removes the need for calling out to ant to copy the files to the application server - this makes it so quick you don't even see the progress bar pop up!