Engadget has published some leaked information about Dell's Inspiron 1435, 1535 and 1735 notebooks:
Specs are the typical Dell smorgasbord of options, but all three laptops start at around 1-inch thick and taper up to 1.5 inches thick. All three also sport slot-loading drives, with a Blu-ray option, and processors ramp up to Core 2 Duo T5850 2.16GHz chips. 3G options are also available across the lineup, and just about anything else you might find useful in a mid-range laptop. Apparently the 1435 isn't due until October, but the 1735 is coming on June 9 and the 1535 on the 26th of this month.