In this DigWP post, guest author David Powell explains how to limit WordPress’ default post-navigation to include posts only from the same author and category as the currently viewed post. This method is effective, but involves making modifications to core WordPress files, something you should only do as a last resort, and if you know what you are doing. If you're comfortable with that, read on to learn how it's done..
Have you ever seen WordPress archives where you select something (usually a month/year) from a dropdown and it takes you to a page where you can view that? It's fairly common. WordPress almost has built in functionality for it, since you can specifically tell the wp_get_archives() function that you want the values to be returned as
Here at Digging Into WordPress, we've attached thumbnail images to every single (non-link-style) post since day one. We started before WordPress 3.0 had the specific feature for thumbnails. We did it just by attaching a file path to the thumbnail image as a custom field. We clearly display each of those thumbnails in the design of the homepage and other various pages where it makes sense.