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.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.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.