hiya,
I'm slightly biased due to my own plans... but...
As properties are historically very cheap at the moment in the US, I'd personally drop the cash into potentially picking up one or more properties over there and renting them out. There's a 'good' chance once the world economy picks up, the values will rise again and potentially makes for an opportunity to make some money if sold later. I understand that not everyone is thinking this way, and may find many other uses if needed. However, as an investment potential, along with perhaps a high interest savings account/ISA/ tax free savings account it's a very good option.
Cheers, DtM! West London & Slough UK!