Does anyone know about co-signing student loans?

[indysteel]

Actually student loan debt is considered "good" debt and does not hurt your FICO score.

That's a bit of an oversimplification. Lenders generally look more favorably on installment loans, like student, mortgage and car loans, than they do revolving debts, like credit cards. But, ultimately, all of your debt factors into your debt-to-income ratio, which is part of what lenders look at before extending credit. And, of course, any missed payments on any type of debt is going to impact your credit.

For students, paying a loan like a student loan on time can help build good credit and establish a good FICO score. For someone like the OP, who presumably has a credit history at this point--and hopefully a good one--adding a student loan debt as a co-signor isn't likely to help her credit score all that much and could hurt her chances at getting future extensions of credit.