InfoPath Forms Services are part of Enterprise edition.

Here you have nice overview

• Compare SharePoint Editions

Also take a look at my answer on licensing requirements for InfoPath forms:

• SharePoint 2010 Standard and Forms

InfoPath Forms Services are part of Enterprise edition.

Here you have nice overview

• Compare SharePoint Editions

Also take a look at my answer on licensing requirements for InfoPath forms:

• SharePoint 2010 Standard and Forms