Rolling over your 401(k) is typically considered a good move for most people who have the option. What you roll it over to, though, is the better question. It is normally suggested that you roll it all into an IRA, preferably a Traditional Deductible IRA. That way it remains pre-Tax and will grow that way for as long as it stays in there. Also, the IRA typically has access to far more investment options than a 401(k).

So, talk to your trusted financial advisor (even one at a bank or credit union) to see what options are available for you to invest in for your new investment.

Sure, a roll over is almost always a good eye. The point is to consolidate your portfolio into places where it can be more easily viewed and managed. Old 401ks tend to carry higher maintenance fees as well. Besides, you lose a small amount of control just by leaving the account with your old employer's administrator.

You should do a rollover as soon as possible to consolidate your funds and re-take control of your investments. If you have another employer sponsored plan like a 401k, just transfer the money there. Alternatively, you can establish a new IRA or send it to an existing one.

Study up the rules on rolling 401ks over carefully. You'll rarely owe any taxes, but Roth conversions can sometimes carry additional costs. If you need more expensive advice, I recommend consulting a professional or at least getting some well thought novice opinions through online forums like Bogleheads.org.

That is a personal decision. Do you like the investment choices in your current 401k, do you like the reporting, do they have good customer service. Do you have other 401k's left at other previous employers? Typically people roll over their 401k so they have greater control, can see all their retirement accounts in one place and have more investment options. You can roll over into an IRA or perhaps into your new employers plan.