[FONT=verdana]There’s no point in waiting. Put the titles to back to what they were before, and then see what happens. Personally, I don’t think it will make any difference, but it should still be the first thing to try.
I cant understand the drop i had as this one was the only change i have done the last 10 days .
Much of the time, sudden drops (or rises) in rankings are not caused by changes you make to the site. They might be caused by changes to external links, or changes to Google’s algorithms, or the arrival of new competitors, or many other factors. That’s why I think the changes you made to your titles are not likely to be significant. It’s more likely that the drop you saw is caused by factors outside your control.
I’ve never used canonical links but aren’t they for sets of pages that are the same? The purpose would be totell SE to only index one of them since they are similar. In this case, the old page is gone so what good is the canonical link?
I’ve changed titles in the past and had a temporary drop in rankings. I would recommend making the title change and getting your titles the way you want them. Even though your pages may shift around a little as google adjusts from the change, you shouldn’t have to worry about any big changes if you’re only changing symbols around.
[FONT=verdana]I agree with WebEminence. Canonical tags are not appropriate in this case. I can see no point at all in creating a second set of pages and setting a canonical link from one to the other.
Either put the titles back to where they were before, and leave it at that. Or, better, remove all unecessary punctuation from the titles (commas, dashes, whatever). But don’t confuse the issue by creating a whole new set of pages.
Google has been doing alot of updates lately and alot of sites are bouncing all over the place. I have had sites on page 11 disappear all together and reappear 24 hours later. I had a site drop from page 8 to page 22 and back to page 10 all in a weeks time. Sometimes you have to wait it out and see what happens.