Over 50s now have bigger ISA allowances.
It's £10 200 in total, with a maximum of £5 100 in a Cash ISA. You can also invest in an Investment ISA..£5100 if you have used your Cash ISA allowance or the full £10 200 if you have not.
The returns from a cash ISA are not that great at the moment, so it may bve worth looking at the Investment ISA option depending on your attitude to risk & investment period.
The limits for under 50s will be increased to the same for over 50s on 6th April 2010.
As always, seek proper independent advice.