What are the latest/newest new slr cameras from nikon and sony?

I want to get one for my birthday the price doesn't really matter and i have no clue what's the latest of these brands i have a point n' shoot from sony (TX7) and i absolutetly love it! But i've heard Nikon has some real good cameras too so can i also get some tips and pointers on my next purchase for a camera please and thanks for your time

The latest dslr from Nikon is D5100 and the newest from Sony is a55.

I wrote a bit more about the Sony a55(see below) - it's a highly regarded camera on sites such as dpreview and I'd recommend it especially if you already have Sony stuff and you're making the transition from compact to DSLR.

Two of their newest cameras are the a33, and a55. They arent reflex in the traditional way, because they use a translucent mirror to archive fasters speeds. They have many nice features like the possibility to record or take 3d photos.

Nikon has a few more or less new nice options, but so far i think a very good choice is the canon 550d (europe) / t2i (in america) that can become almost like a pro filming camera with the magic lantern firmware, as long as you are careful to install it properly (i advice you to seek someone who has done it before, and read a lot about the project)

Nikon:
D5100 was just announced, in the shops end of this month. Before that came the D3100, before that the D7000 and that means nikon has done a complete overhaul of their entry level models in the last 8 months or so.

Combine any with an 18-105 nikon lens and you're well on your way to enjoying a nice hobby