Hi Paul,
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.
Cheers,
Jon.