I think having a title comparison option on the user's page,
so you can see what titles you have in common with that person would be nice.
Like "compare lists... reading/complete/etc'".
Something along the lines of the feature they have on Goodreads. :3

So, yeah.
Make picking whom you should stalk that much easier. xD

Hrodulf and Bjornolfr, you will not be forgotten.
[img]http://i411.photobucket.com/albums/pp199/SyberAngelGabrielle/couplesig.jpg[/img]
[color=black]And if the world were black and white,
you would be my rainbow in shades of grey.[/color]

Click 'n Play!

If I had a fantasy self, it'd be a tentacle monster.

there is a similar function
click on a title both of you have read/are reading
click on the link on XXXX reading lists (or completed if you like)
wait until the window finished loading
search for user's name
get percentage

note: this gives you the percentage of your list that is currently on the other's list, that means people that have very long reading lists will probably score high (it doesn't crossmatch their list against yours, but yours against theirs)

in need of romance?
uncommon, sad, sweet

Don't public lists already indicate which titles are also in your lists? It works just like the releases list (check for complete, document for reading, and exclamation for wish).

...Unless you're proposing a feature that allows members to follow other members.