Craig Walls, author of spring in action just blogged on the subject of Spring and Guice. Pitting the two inversion of control containers against each other he concludes :

“I’m glad that I spent the time to learn a little about Guice, but I’m not all that “juiced” about using Guice. In addition to all of the reasons given above, I’d much rather build my application against a well-established container like Spring that has a wealth of integration points with other frameworks and APIs”

Anyway it makes for an interesting read and for me it confirmed the initial impression I got from Guice.