Just saw those myself. Both are great options, and it makes me all kinds of happy that even budget machines are getting 3-4GB memory and frequently Gigabit ethernet and wifi N.

Also, it's worth noting that the Pentium T4x00 series is really just a cache-disabled Core 2 Duo and oftentimes performs equivalently or near-equivalently. Wonderful budget chips crippled only by crummy Intel graphics. Ion 2 is a promising option, but the HD4200 in AMD machines is nearly as fast as Ion 2 and doesn't cost an extra $50. Same equation: if you want CPU power and battery life, get a T4x00. Want some light gaming? Add Ion 2. Willing to compromise a bit in CPU and battery life and save some money? Athlon II.