Good question. The short answer is that the process is not automated, yet. Dependent project inclusion at deployment will be one of the first features we implement after the GA release tomorrow. We know it’s important, but we just haven’t gotten to it yet.
The easiest workaround right now is to export your taglib project in an appropriate jar format and set the target to be the WEB-INF/lib directory of the web project that uses it. When you perform the jar for the first time, be sure to save the .jardesc so you can just run it directly from then on. Or, you can just write a simple ant script to do the jar and appropriate copies yourself.
Automated relief is coming soon. Stay tuned.
–Scott
MyEclipse Support