There are many resources on the web to help you make great looking graphics. Here are a list of sites ordered by category that can be used to enhance your work.
Banner Information and Tips
www.carolinabannerexchange.com/banner-ad-comeback.htm - An excellent collection of links and articles concerning banner ads.
www.iab.net - The Internet Advertising Bureau. Contains standards and guidelines for banner advertising.
www.allthelogos.com - This is an online database of logotypes and logo design. This includes more than 70,000 companies and organizations brands logos, team sports logos, countries flags and insignia as well as signs, general usage logos and more.
www.bannermakerproforflash.com - Easily create banner ads and flash intros (swf files). Does not require flash. From the makers of Banner Maker Pro.
www.imageshack.us - Allows hosting of image files, including flash files. Files can be uploaded directly from Banner Maker Pro by clicking on the "Upload to ImageShack" button.
www.photobucket.com - Allows hosting of image files, including flash files. Also allows hosting banner ads.
GIF Crunchers and Reducers
www.gifreducer.com - This free online gif shrinker will shrink both animated and static gifs. The dithering options can also be set to improve the output.
www.jpegreducer.com - This is a free jpeg compressor that will shrink jpg files and photos.
www.chemware.co.nz/tgo.htm - Trout's Gif Optimizer is an gif optimizer for Windows. The program is free, but you can get a banner free program for a donation.
Backgrounds and Buttons
www.axclipart.com - Almost 150,000 all free webgraphics, which include over 33,000 backgrounds, bullets, webpage divider lines, and over 75,000 buttons with blank and pre-created buttons.
www.abcgiant.com - This website has a large number of backgrounds and buttons and other web graphics. Definitely worth a look. Requires free login.
www.clipart.com - The web's largest subscription-based collection of clipart, photos, fonts, animations and sounds.
www.clipartgallery.com - This site contains clipart, buttons, and backgrounds.
www.pdclipart.org - A large selection of public domain clipart.
www.clker.com - royalty free and public domain clipart.
www.publicdomainpictures.net - Royalty free stock photos. All pictures are free for commercial and personal use.
www.sxc.hu - A collection of royalty-free photos.
www.corbis.com - Professional stock photography.
www.istockphoto.com - Professional stock photography.
www.gettyimages.com - Professional stock photography.
www.searchfreefonts.com - An easy to search directory of fonts.
www.fontfoundry.com - Another excellent collection of fonts.
www.fontfreak.com - A nice collection of fonts and dingbats for PC And Mac.
www.myfonts.com - An excellent collection of fonts for sale with an easy to use search tool.