For the longest time, I would dump any contacts email address into LinkedIn with an appendage to the first name to remind me where I knew them from. If they susequently joined LinkedIn, then I'd pile on to connect with them. I rarely invite people. It's just to much hassle explaining it, cajoling them, and convincing them. If some one joins on their own, it is a done deal to do the old LinkedIn version of the Vulcan mind meld with them. So routinely dumping in large numbers of email address was a as needed task. Let them "stew" and once a week see who was "discovered".
Now LinkedIn doesn't let me put in "other contacts" so easily. Defeating an easy way to build a network. Arghh!
Reinke Faces Life 
… but I can’t load “other contacts” like I was doing. :-(
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UI stuff is always tricky to get right for everyone. Actually, we now put it right on the home page when someone from your contact list joins LinkedIn. Also, you can now sort your contact list by recency (when they joined LinkedIn) here:
http://www.linkedin.com/otherContacts?membersOnly=membersOnly&context=2&sortAction=mid
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