It's a new, free, DHTML Joomla Pop Up GPL module from templateplazza.com that was created based on Mootools javascript effect.
This module will display your message in eye catchy fadein-fade out effect, and not just that, this module also has flexible configuration options that can be configured from the backend parameter.

w3c.org compliant Page Peel Banner Module for Joomla 1.5 native. Display either a single custom Ad, or display an entire Ad campaign utilizing the Joomla! Banner Component which comes standard with any fresh install of Joomla 1.5.
Create an alternative Banner to display when the paid banners run out or if they expire.
This module is based upon the webpicassa open source solution and has been worked into a Joomla module. The biggest advantage to this module over similar modules is that this one validates to w3c.org standards.

This is 20 ads version for Mini Ad Spot. If you experience problems in saving changes in 40 ads module, please use this.Only for Joomla! 1.5.x!
This module enables you to display up to 20 mini ads.
Features:

• up to 20 mini ads
• custom colors and opacity for tooltip
• custom path to order page
• custom description
• custom title
• different ad size (default 32x32 px)
• custom animation for tooltip
• follow or nofollow attributes for links
• open ads in the same or in a new window
• align left, middle, right
• custom space between ads
• cache system
• sorting
• different tootlips
• valid dates
• small captions
• tracking
• automatic script loader

Camp26 Sticky HTML is special module that pops up at the center of the page to display anything of your choice, including including various types of advertising and affiliate (like simple banner code, simple text html, amazon affiliate, google adsense), announcements, and others copy and paste codes for Joomla site. It's an effective yet graceful way to reach out to your visitors.

Simple AdSense provides a simple way to display Google AdSense on you Joomla site. Unlike other modules of this kind, your ads can be aligned and the AdSense code is responsive to the modifications made from your Google Account.

This module will help you show Adbrite ads in joomla website.AdBrite, "The Internet's Ad Marketplace", powers the world's most trusted and transparent marketplace to buy and sell online advertising.This Adbrite module from Joomlaspan brings you Adbrite right into Joomla! Now you can use AdBrite with Joomla! without any pains and will "all" controls possible.