Hello Ida, a warm welcome to the Cameralabs forum! Before you make many more posts, be sure to read our House Rules
, just to make sure that you follow all of the guidelines.
To answer your question, the 1000D (Or Rebel XS in North America) is a nice Canon camera, although it's been aging quickly since it's 2008 release date. It's a decent entry level cam, although it's performance isn't quite on par with some other DSLRs. With only 7 AF points, a 10MP sensor and a smaller low-res display, it's harder to recommend. Although, it's design certainly seems more "Pro" than the A390, with more buttons and a less streamlined superzoom look. It also outperforms the A390 in high burst shooting, with 3FPS as opposed to only 2.5.
The Sony is a nice new camera, recently announced. It's ISO is expandable up to 3200 (As opposed to the 1600 of the 1000D), has a better LV system like many Sonys, has built in IS, a larger higher res display that even tilts! Although, it has less buttons and uses a CCD sensor as opposed to the CMOS of the 1000D. Generally, CMOS sensors are better on account of their superb performance on poor lighting situations and their better battery life.
I cannot recommend either of these cameras to you yet, as I don't know what you'll be using them for. What kind of shots will you be taking? Is this your first DSLR? What do you already know about photography and are you ready for full manual mode? Is ease of use important? What's your budget for the body and some lenses? These questions are very important, considering that these will determine what you're looking for in a DSLR and help you decide.
Also, let's add a few cams to the list:
Canon 550D (Perhaps too expensive)
Sony Alpha A33
Sony Alpha A55
Sony Alpha A290
Sony Alpha A580
Sony Alpha A550
Nikon D90 (Perhaps too expensive)
Anyways, I've GREATLY expanded the list!
Hope to hear back!