All good Wh33ls,
The shortcut is g, without the Ctrl+, just g.
So merge one pair of verts. select the next ones, hit g and repeat!
If all of your verts that need merging are along the Y axis (ie, you've mirrored half a model over) you can go into the merge verts options, lower the range to minimum, select all the verts along the Y axis and hit enter, it should merge all of the pairs together as long as two sets aren't too close together anywhere. If there is a few here and there that are too close you'll probably have to do it one by one.
Last edited by Dango77; 07-09-2009 at 08:08 PM.