You could use the Favorites section. I favorite my most frequently used sites and use that for most logins that I access often.
Would that work? If you have a particular use case that you can run me through that would be wonderful.
Also, user gwkoehler, currently above me in this thread, suggests the ophttp:// and ophttps:// in front of users to open in 1Password. There is a bookmarklet for this here:
http://www.macstories.net/links/1password-4-1/
Kyle
AgileBits