First off, on the DS there are 6 games coming out this week with Harry Potter being the biggest release:

Harry Potter and the Order of the Phoenix (June 25)

Touchmaster (June 25)

Hoshigami: Ruining Blue Earth Remix (June 26)

Nervous Brickdown (June 26)

Ratatouille (June 26)

Vegas Casino High 5! (June 29)

On the Wii side of things, after last week's 1 game release this is a week full of new games. 7 new games hitting the Wii this week led by Pokemon Battle Revolution, the BIGS and Harry Potter:

Pokemon Battle Revolution (June 25)

The BIGS (June 25)

Harry Potter and the Order of the Phoenix (June 25)

Transformers (June 26)

Chicken Shoot (June 26) Worst Box Art Ever!!

Driver: Parallel Lines (June 26)

Ratatouille (June 26)

See anything you like? 

Hoshigami? What's that?
Nervous brickdown might be interesting.

your wrong, chicken shot is not the worst box art ever, megaman (nes) US box art is the worst of the all humanity jajaja

Huge week for the Wii, hopefully we'll see some massive software sales.

I'll probably get Pokemon, nothing else on this list appeals to me.

Edit: Might try out the BIGS because a good baseball game on Wii could be good. 

Pokemon Battle Revolution is fun for as long as it lasts, one of the most beautiful games though on the WII, real battle game, Excite Truck is to me 10 times more fun. Harry Potter apeals to me, never bought a HP game before. Although I have no idea what kind of voice actings the Japanese version will have, has anybody have a idea about that? I probably ask a stupid question anyway :D

I want to try the Bigs and Harry Potter but not going to have time to rent those for a few weeks (and still busy with RE4 even if I did have the time).

I'd want to play Bigs based on good reviews from regular players, and professionals..
Harry Potter on Wii might be good to pick up -- but probably rent out

Nothing for me on DS, but, again, might pick up HP by hiring it out

the BIGs, Harry Potter (probably a rental), Hoshigami, MAYBE Transformers (thinking it's probably going to be a lot worse than the PS360 versions though), and Pokemon Battle Revolution when it gets down to cheap (30 bucks or less).

TouchMaster looks like a cheap Clubhouse Games clone. But if it comes out well and is priced right could be a good pickup.

The Wii games are kinda meh will have to see how the reviews turn out and maybe rent 'em first.