Here’s a good solution for those that want to send good looking emails to their business clients, check out Equinux Business Templates. As the web site promotes its product, “Add over 200 new templates to Mail with Stationery Pack Business Edition. With 12 new templates and 17 different ways of using each design, you can tailor emails to your audience. Drop in your photos, company logo and signature for professional looking emails.”
If you don’t want to purchase it, at least it’ll give you some great ideas for your iWork Pages documents and brochures.