Canon 40d and Speedlight 430exii
 

Can you use the 430ex ii wireless without any other equipment. I saw a video on youtube and the photographer had the 5d and it worked without anything else.

You would need to buy a wireless trigger for the 40d, newer canon cameras like the 60d, 7d and the 5d mkiii have the capability to control compatible flashes wirelessly.

I have a Nissin that works wirelessly with my 60D.
Web says....

Nissin Di622 MkII Key Features
HIGH POWER G.No.62m (ISO 200) is obtained at the reflector position of 105mm focal length.

BOUNCE FLASH Bounce and Swivel head for 90 degrees upward and 270 degrees horizontally. The flash head also stores a small reflection panel for fill-in shots.

TTL FLASH Di622 MARK II is compatible with Canon's E-TTL and E-TTLII system.

WIRELESS REMOTE FLASH Slave Digital (SD): Di622 Mark II synchronizes to pre-flash systems. Slave Film (SF): Di622 Mark II synchronizes to traditional single flash systems. Wireless TTL: Di622 Mark II synchronizes to wireless remote flash systems. The master flash is to be set at Channel 1 group A in wireless remote mode.

TTL FLASH LEVEL COMPENSATION The flash power level can be adjusted from -1.5EV through +1.5EV by 0.5EV steps.

NISSIN ORIGINAL “MY TTL” SETTING The TTL flash power level is pre-set for exposure at factory. You can, however, reset the TTL to the desired exposure level, in +/- 0.75 Ev. by 0.25 Ev increments.

Specifications:

Guide Number: 44m, 145ft. (ISO 100), 62m, 205ft. (ISO 200)
Illumination coverage: 24-105mm (16mm wide angle diffuser)
Turning head: 90 degree upward, 90 degree to left, 180 degree to right
Power source: 4 X AA or equivalent Mi-MH, lithium
Recycling time: 5 sec., with fresh alkaline batteries
Flash exposure control: E-TTL and E-TTL II for Canon cameras.
Manual(Variable power): 6 levels : Full - 1/2 - 1/4 - 1/8 - 1/16 - 1/32 powers
Wireless mode: SD: Slave Digital (with 6 levels), SF: Slave Film (with 6 levels), Wireless TTL remote Channel 1 Group A (Controlled by master flash)
Flash Power Lock: FE lock (for Canon)
Dimensions: 77(W) x 130(D) x103(H) mm / 30(W) x 51(D) x 40(H) inches
Weight: 315g (without battery) / 11oz