I too received a settlement offer from Barclays for 45% of the original balance of $10,000 which comes out to be around $4500. It turns out that this is part of their "settlement program" and not a "manual settlement offer". I've already paid the first of the first 2 of the 3-installment agreement. The first 2 payments were for $1000 total, and the remaining $3500 is due by 5/2/2011. While I would save a lot of money by fulfilling the obligation, I discovered that they will report to the credit reporting agencies as "settled for less than original amount" and maybe even a statement that the rest will be "charged off". The "settled for less than..." statement on my credit card would be on there for 7 years and would significantly hurt my chances of getting a home loan or car loan in a few years (or at least ensure the interest rate will be ridiculously high if I even get the loan).
Now, I'm drafting a letter for a settlement offer for the same amount of money to them but including the provisions that the account be deleted from my credit report and that no negative report will be made to the credit reporting agency about the account.
We'll see what happens, and needless to say, I hope it works.