Sage Wedding Pros is "a resource for wedding professionals who want to have smarter businesses." Recently, the site's Michelle Loretta wrote about how she loves the integration between Formstack and Highrise.
Once I started using 37signals’ Highrise to manage my client information and communication I needed to have everything get into Highrise in one easy step...Formstack is easy to use and I love how it integrates with Highrise. You build your form or questionnaire in a few steps. You can add your logo and customize it so that it ties with your company branding. For me the branding match is more important than having a “template” form.
To integrate with Highrise, simply input your merge code (called an API key). Voila! When someone completes a form the data (name, address, phone, etc) goes directly into your Highrise database. No need to copy over info to multiple programs. You can also integrate with Mailchimp (for newsletters), Paypal, and a bunch of other programs. You can also embed the form onto your website.