We increased my Wife's 401(k) contribution from 5% to 15%. This takes her contribution from $2,775/year to $8,325/year. We're still waiting to hear back from her HR department as to when the new contribution level go into effect.
We decided to increase our 401(k) contributions as much as possible and force ourselves to get used to the lower take home pay. We may not be able to put as much into our Roth IRA's, but at least we know the money will be invested before we can get our hands on it.