I think that it would be really great if the subscribe forms that we can copy and paste from the lists section of Sendy were able to detect on-the-fly if the fields were correctly completed, and warn the user to try again.
Certainly the current forms work just fine but I just think that it would represent another level of polish for this, otherwise, very polished piece of software.
PS I have implemented an ajax form as per one of the forum posts - now I'm just waiting for the day that I upgrade Sendy and forget, and overwrite the changes!!!!