Do you have any plugin recommendations? I'm working on a small Grails app for our church video library and I'm currently using the "searchable" plugin for integrating with Lucene. I've also used the security plugin before integrating with Acegi/Spring Security.
I'm very much interested in hearing your favorites.
I think the Searchable plug-in is very useful. Being able to just mark your domain classes as 'searchable' is really cool.
I was very impressed with the RichUI plug-in. When looking at a rich client plug-in for the book I spent a while trying out the Grails UI plug-in, and it seemed a lot more effort than using RichUI.
If you are working with Grails 1.0 the testing plug-in is an absolute must. It makes unit testing of domain classes and controllers extremely easy. This is a core plug-in as of Grails 1.1.
I started off using WebTest to demonstrate functional testing in the book. I later stumbled on the Grails Functional Testing plug-in and was so impressed with it I ended up switching over to use it in the book.
In the book I use JSecurity, which again I was very impressed with. Interestingly the JSecurity plug-in is supported by Spring Source, whereas the Spring Security plug-in is not.
There are so many plug-ins available for Grails that I haven't used, so there are bound to be some real gems out there.