Making a customized adsense channel

Here are few simple steps that can help you in making customized adsene channels.

1. Log into your account at http://www.google.com/adsense
2. Under the AdSense Setup tab, visit the Channels page.
3. Under the AdSense for content sub tab, make sure you that have selected custom channels.
4. Click the radio button next to the channel that you would like to make targetable, then click the corresponding 'edit settings' link.
5. Click the checkbox marked Show this channel to advertisers as an ad placement and enter a description for your channel. Keep in mind that advertisers will see the name and description, so you want to provide something accurate and informative that will represent your site well.
6. Click 'Save channel'.

for more info visit google adsense website.