"It is job-one urgency around here," said Ballmer during a speech to financial analysts at the firm's headquarters in Redmond yesterday.
"We're working with our hardware partners, we're tuning Windows 7 to new slate hardware designs that they're bringing to market. And, yeah, you're going to get a lot of cacophony," he said.
Ballmer did not give a release date for any new products, but hinted at a sense of urgency to get something to market in the near future.
"Some of you will say, when? And I say, as soon as they're ready. Nobody is sleeping at the switch. We are working with partners to deliver products that people really want to go buy," he said.
"There will be people who do things with other operating systems. But we've got the application base, we've got the user familiarity. We've got everything on our side if we do things really right."
Ballmer displayed grudging respect for Apple's success with the iPad, and admitted that it had irked Microsoft.
"Apple has done an interesting job of putting together and putting a product out which they've sold certainly more than I'd like them to sell. We think about that. We think about that in competitive sense," he said.
However, Ballmer confirmed his belief that laptops retain a distinct use in the market. "I've been to too many meetings with journalists who'd spend the first 10 minutes setting up their iPad to look like a laptop," he said.
"Laptops are well designed for a lot of things. I notice they are all light. In fact, if you look around this room, they all weigh zero pounds because they're just sitting on the table."
Microsoft chief operating officer Kevin Turner announced at the same event that IE9 will be available in beta from September.