The biggest issue to take into consideration at the moment is the rate of interest being earnt and the high value of Inflation. It may be all well and good getting 3-4% on deposit account, but when you look at Real rates of returns, ie taking inflation into account, your money is going no where. Infact its being eroded all the time.
Cash as an asset is fine, for short term savings, household emergencies, (eg, always have 3-6 mths of monthly outgoings set aside), but longer term its crap.
Key is not all your eggs in one basket, diversification!
Any Questions pm me, i do it for a living.