http://dailyappshow.com - With Group Email! you can send email with attachments to single contacts, to groups, to handpicked set of contacts or to custom distribution lists. You can optionally attach photos, videos, documents, locations information with map and address, audio clips, pasteboard content and contacts information (vCard or text).
And if you send the same email text frequently, you can create a template and use it to save typing or to send nice HTML emails.