Yes, you can still make contributions to your individual 401(k) plan for this year assuming you file a Schedule C as a sole proprietor. You will want to complete an elective deferral form for your files designating the amount that you wish to defer even though you may not make the contribution until next year. However, the total combined elective deferral amounts (to both plans) that you can make for the year are limited to $15,500 ($20,500 if age 50 or older). So if you contribute $15,500 (assuming you are under age 59 1/2) to your individual 401(k) then you cannot defer anything to your new employer's 401(k) plan (due to the IRC Sec. 402(g) limit) for 2008.