Despite potential tax and investment problems, more investors have been borrowing from their 401(k) plans or taking hardship withdrawals in recent months, some retirement plan providers say. Many in the field expect more borrowing in 2008, as consumers struggle with tighter credit and potentially higher mortgage payments. "I don't think it's a groundswell but it's enough to be noticed," said Rick Meigs, president of 401khelpcenter.com, which provides information on 401(k) plans. Increased borrowing on 401(k)s could be because of the credit crunch and slumping housing prices. To be sure, the indications are preliminary; it's too early to say why it's...