Do you know about the InfoPath 2003 SP1 Preview release? There are actually two free downloads available:
Anyone can download and install this version of InfoPath and use it until it expires.
When the Office System 2003 SP1 is released (mid-2004), InfoPath will be updated to have many new features, in addition to performance improvements and bug fixes (and if you just want the performance improvements and bug fixes, the new features can be turned off). The SP1 is completely backwards compatible with InfoPath 2003.
This preview gives you a chance to try out an initial version of the SP1 bits now so that you can learn the new features and plan for the SP1 deployment within your company.
The SP1 release is very important in that we were able to address customer wishes. Give it a try! We're certainly excited about it and will be posting about InfoPath SP1 here often (and we'll make it clear when a post is SP1 specific).