The M&IE is broken down to breakfast, lunch, and dinner, plus incidental costs. The IRS hasn’t said whether you can use the M&IE rates for some meals and actual costs for others on the same day.
A retirement account to which up to $4,000 (or $5,000 if you are 50 or over) may be contributed for 2007, but deductions for the contribution are restricted if you are covered by a company retirement plan. Earnings accumulate tax free.