Multiple Domains

I have multiple domains, as do a lot of people I assume. For example, I have and and also and

From an SEO point of view am I wasting the domain names by simply aiming them all at my favourite domain ( Should I use the other domain names in a better way?

If I have a domain name which is more keyword hungry, but is long winded, such as

but I also have

I would normally redirect to, because it’s easier to remember, and it’s certainly prettier to look at. But would I be better advised to redirect the other way? I could still advertise the website via traditional marketing (posters for example), with the shorter domain name, but then when it redirects it looks untrustworthy. Which I would see as a key issue.

Your opinions please (thanks in advance).