Dan Harrelson from Adaptive Path has written a very interesting blog post titled Rapid Prototyping Tools and what makes good prototypes. My long time favorite Adobe Fireworks is mentionned along with Axure RP Pro (which is a newer tool in my arsenal) but also several others including online tools like Balsamiq Mockups.
What is most interesting to me in the post is the first part before he lists the tools and where he explains the principles of good prototyping and why it should be done in the first place. For me, this comes following a very well received presentaion at the IA Summint 2009 from Fred Beecher titled Integrating Effective Prototyping Into Your Design Process and which I followed through live tweeting as I couldn’t attend.
Both Harrelson and Beecher press the important point that creating interactive prototypes helps us design better user experiences as they help validate a design direction early in the process before investing a lot of money and effort into design or development solutions that may not yield the best results possible.
I strongly suggest you take a look at Dan Harrelson’s blog post and go through Fred’s presentation slides. They may put you on a track to improve your own process and deliver better solutions to your clients.