We recently took stock of our own thank you pages here at VerticalResponse and decided to make some sweeping changes. We thought of all of the ways you can use a thank you page after someone either signs up for your newsletter OR buys your product or service. Here is what we came up with:
Friend Get a Friend - After someone purchases from you or signs up for your newsletter this is the perfect time to ask them to get a friend to do the same. They've just had a super-positive experience with you and trust you enough with their information. Why not either just ask them to tell their friends? Give them something for getting their friends to sign up too if you can.
Cross-Sell - If you know your customers bought something that goes well with another product or service you offer, offer it to them right on the thank you page. You'd be surprised how many people decide to go back and try again. If you offer more than one newsletter, include links to the opt-in forms for them.
Tips - Does your product or service have some tips or tricks that go along with it? Your thank you page is the perfect place to put them!
Product Tour - If you have a video or tutorial for your product, your thank you page might be a perfect place to put it. Check out Marka Online, they sell computer bags for women and include videos of their products.
Customer Support Information - Perhaps you'd like to put your customer service hours, phone number and links on a thank you page. Did they purchase something from you? Include shipping information so your customers know when they can expect their product.
Advertising! - Make some dough on your thank you page by including 3rd party ads or targeted Google Adwords. Word to the wise: make sure you suppress your competition. The last thing you need your customers seeing is your competitor's ads on your thank you page. (Thanks Mark Brownlow for commenting and giving us the lowdown on Google's Policies on Adwords and Thank You pages. I stand corrected!)
Tell Your Story - If you've got a story to tell, reinforce your customer's decision to buy or sign up to your newsletter Make them feel better about taking an action with you by telling them the story behind your product or service. It's a great way to make your customers feel closer to you.
Got any of your own? We'd love to hear them!

These are excellent ideas, as I have come to expect from you folks. One you may consider on lead generation websites is to have an additional offer for an e-book or something of value. Carry the values from the first form to the second (typically doubles response rate), and ask additional questions for lead scoring (will usually be okay, since you already have initial form submission and you are offering a good incentive).
Posted by: Karl K. | February 19, 2008 at 10:59 AM
Great ideas! Just one thing...the official "terms and conditions" for Google's contextual advertising forbid their use on thank you pages. It's a little known prohibition, but it could get you in trouble with the Adsense folks...
Keep up the good stuff!
Mark
Posted by: Mark Brownlow | July 31, 2007 at 05:25 AM