One tablet is said to run Windows and the other uses Android or possibly Chrome.
It's par for the course today to see other competitors step into new markets after hanging back to see what Apple does. I guess it's a sound business idea in some respects that allows competitors to see how the public reacts to new products Apple offers before they jump in. such was the case with the iPad when it was first announced. Now that the public has received the iPad with interest and is ready to buy the device, we are seeing more and more competing products are announced.

Above: Asus puts iPad in its crosshairs
Asus has announced that it will be launching a
pair of tablet machines to fight the iPad in the market. Asus will debut its tablet systems at Computex in June. We don’t have many details at this time. What we don't know is that Asus will offer a Windows unit and one running Android.
The iPad is set to hit stores and customers hands this Saturday over in America. The launch date for Aussie fans of the iPad was
pushed back to late April and will cost us $649 for the 16GB version, $779 for the 32GB, and $829 for the 64GB version. No pricing on the 3G models has been offered at this time.