What is an easy way to calculate & keep track of accrued interest for USA or CDN corporate bonds?

I have bought USA and CDN corporate bonds (with semi-annual payments of interest) over the past year or so. When caculating my income taxes, I am supposed to use the 'accrual method'. WHat is an easy way to caculate the income taxes owing using accrual method, given that the tax receipts sent to me are for varying 6 month periods.....its a nightmare to calculate this for each bond and not underpay or over pay taxes over time. Is there good software out there (free or commercial?)