Videoclips are in the format 3gp and were tested for Nokia 6230i.
Wallpapers have 4 resolution :
128 x 128 for Nokia 60XX, 3100, 3200, 6610, 7210, 3220...
160 x 120 for Siemens C65 or Sony Ericsson T630...
176 x 220 for the mobile phone with big display (Sony Ericsson K700i...)
320 x 240 for the newest mobile phones
Polyphonic ringtones are in the format mid most of the songs are four-instrument, hence all the phone that support MID shall be fine. If you want am MP3 ringtone, you have serach somewhere else.
Monophonic ringtones need to be created only by yourself. Unfortunatelly only for Nokia phones, those which have the built-in Tone Editor (Nokia 3310, 3410, 3330, 3210 etc.).