IRA ANALYSIS. Some new Internet sites with interactive worksheets can help you figure out which individual retirement account is best for you. They also help you see whether it makes sense to convert money you have in a traditional IRA into a new Roth IRA. The best sites are www.vanguard.com and www.troweprice.com/iraworksheet/main.html. You can find an encyclopedia of information on the Roth IRA, which includes extensive financial-planning strategies, at www.rothira.com.