spiderzWPC gave a good response. i would expand a little bit on that. here's an explanation on media formats for wp8:
Media support
According to Brandon Miniman's test review for pocketnow.com, he stated "
if Zune can play it, your Windows Phone 7 device can play it" ? this refers to the supported playback of files.[SUP]
[41][/SUP] The audio file formats supported include WAV, MP3, WMA, AMR,
AAC/MP4/M4A/M4B and
3GP/3G2 as standards. The video file formats supported include WMV, AVI, MP4/M4V,
3GP/3G2 and
MOV (QuickTime) standards. Unlike the previous Windows Mobile operating system, there are currently no third-party applications for handling other video formats. The image file formats that are supported include
JPG/JPEG, PNG, GIF, TIF and Bitmap (BMP).[SUP]
[44][/SUP][SUP]
[45][/SUP]
Custom ringtones under 1MB, and less than 40 seconds long and the genre marked as Ringtone to appear on the phone, and are either created on the computer or downloaded through apps. Custom ringtones cannot be used for text messages, IMs or emails.
apps that i'd recommend just from a personal preference that will help make your wp8 experience even better are:
-metrotube for youtube
-weather flow for weather app and nice lock screen integration. if you need radar for weather then amazing weather is honorable mention.
-mehdoh if you like to twitter alot
-integrated facebook in people hub. make sure to add your facebook account to your microsoft account and enable facebook chat in your facebook settings within your microsoft account. i also like the microsoft made facebook app (some people dont) but i use that with the integrated people hub for all my facebook needs.
-there's no good music or video app for wp8 yet so you have to use the integrated ones. but VLC is coming for wp8 so the video apps will get a huge upgrade as far as playing other formats like avi or mkv.
-nokia creative studio for touching up your photos. for the daytime photos i use the clarity option to add sharpness to the photothat's lost from the over softening algorithm that the camera has right now. nokia has acknowledge this and will come out with a fix for it.
-nokia drive+ beta for navigation has gotten better now and doesn't have the battery issues it had at release.
-netflix app i use alot for watching movies over wifi.
-if you dont want to use the people hub to post pics (which i dont see why you wouldnt, it works very well) then somee is a very good app for posting pics to facebook, twitter, etc.
-if you like to use IM instead of SMS to talk to friends then metrotalk is a very good option.
-smart shot i use alot when taking pics, it helps you get the best pic by taking 5 quick shots and allowing you to choose the best out of them then deletes the others.
-skype for well.....skype. hehe.
-skydrive for a free 7gb of data backup. cant beat that.
thats all i can think of now. hope this helps.