I use WordPress.com so can’t use plugins, and am looking to make the tables I use on my site sortable, and if possible, pull up results based on a search of an Excel database I have in the background. Site is http://www.averageopposition.com, and am currently just posting pictures of Excel onto it.
AJ had a good idea. It occurred to me that you have yet another option, depending on what you want to accomplish. You might try using Google Docs to put your spreadsheet online. You can include a link on your site to share it publicly, or you can invite individual people via email.