There is a FAQ on cross pollination that answers your question directly and specifically. Worth reading.

Here is a link that might be useful: Cross pollination in tomatoes

Wow. Thanks. Do you happen to know if there is one for peppers?

Same FAQ applies to peppers.

Dave

Thanks for information.
I also plan to plant some in my backyard.

Here is a link that might be useful: http://forums.gardenweb.com/forums/load/tomato/msg012053516535.html?2

Creek-side, you'll be interested the FAQs on the Seed Saving forum. Here's how to save pepper seeds. Unfortunately, it doesn't address the issue of cross-pollination:
http://faq.gardenweb.com/faq/lists/seedsave/2002084357025280.html

Here are a couple of FAQs from the Hot Pepper forum:
Which Peppers Will Cross-Pollinate?
If I Plant a Habanero Next to My Banana Pepper, Will I Get a Hot Banana Pepper?

Do a Search on the Hot Pepper forum for prevent cross-pollination and take a look at those threads.

For future reference:

Seed Saving discussions

Cross pollination discussions

Dave

Great FAQ. I'm going to have to bag a few this year since I've had cross-pollination in the past and it wasn't a fortuitous cross. Thanks.