In online games the range allowable is 600 rating points (you can challenge a player at + 300 or -300 of your rating, meaning it is not impossible for you to win over the +300 player or lose to the -300 player). Blitz ratings are on the whole around 300 to 400 points lower than your online rating. I'm not sure if the same point scales are used in blitz/correspondence games, but see no reason why they shouldn't be. I suppose you should take an average of all your ratings to find an estimate of your true playing strength.
Am I 1250 or 1900?
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It's important to recognize that your rating in Live Chess measures your performance with respect to of the other Live Chess players, and that your tactics trainer measure your performance with respect to the other Tactics Trainer users etc. and that these are all different pools of players.
To some extent they also measure different types of skill, which may contribute to this discrepancy -- people with different relative balances of the skills involved may well end up with a markedly different distribution of ratings than you have.
Chess Mentor and Tactics Trainer ratings are way off base.
My Chess Mentor rating is above 2300. The fact that one can be rated 1900 and get say 53% on a 1200 rated problem (as in you basically got it wrong several times and then got it right), and still get +1 rating is absurd.
My Tactics Trainer rating is less ludicrous but I've also used tactics trainer a lot less of course it just tests one aspect of your game so its hard to give a meaningful "rating" out of it, rather than a tactical proficiency score.
In Live Chess my rating is about 1250, in Online 1700, in Tactics Trainer 1400 and in Chess Mentor 1900. Now I do understand that everyone's ability varies over chess at different speeds, but it seems to me that these numbers span a range that is too big. After all, I am using the same brain for all the activities, and I don't spend a very long time on my Online games or on Chess Mentor. Is it just that the various scales are based at different points, so that most people have ratings that are in about the same relation?