I don't think I have ego tricks. When I find myself confronted with a problem that I'm unable to resolve, I just go do something else for a while, so that I'll have to re-acquaint myself with the problem when I return. Since I tend to forget things rather quickly, I'm often lucky enough to have forgetten the mistaken assumption that impaired me from solving the problem in the first place :-)
I've heard this referred to as the `mannequin effect', so named because
it would appear to be useful to have a mannequin on a trolley that one
could simply get up, go fetch, and talk to about the problem (as opposed
to bothering a presumably busy human about it).
Update: Of course, the mention was right here on PerlMonks
(not Advogato as I'd previously thought). See
this node, by lemming.