The Web Search plugin allows Quicksilver to search the web from its interface. Standard URLs (without ***) added to the plugin’s Web Search List are still cataloged and made available in the first pane. It’s easy to make a list of custom-named URLs.
Click the ‘+’ button in Preferences>Catalog>Custom and select ‘Web Search List’. Click the ‘i’ button at the bottom corner and, in ‘Source Options’, click the ‘+’ to add a URL with a name.
Change the name of the new Web Search List to distinguish it from the others. This is a little flaky. Rescan the Catalog, close the window, relaunch QS and check if the new name stuck. Make a Trigger for [URL list]>Show Contents to browse the list.

This is great for URLs that need to be regularly pasted into text. Make an internal trigger for ‘Paste with Clipboard’ and Roberta’s your auntie.