For the year 2004-5 the typical annual payment is £6617 for a couple and £4139 for a single person*.
Because they are only increased in line with inflation they will not keep pace with earnings, and will, relatively speaking decline in value over the years to come.
Use this calculator to get a very rough idea as to how valuable the Basic State Pension will be in the future into your retirement.
*Single person figure is for someone with full rights based on their own NI contributions or those of their late spouse, and the couples figure is where one person has full rights and their spouse is entitled as a result of those rights. Actual pension rights depend on individual circumstances.