Ringtones were once the big thing when it came to making money online. I think part of this popularity was due to non-techy people not knowing how to send files via infrared to their phones, and also because it was hard to work with the old midi/polyphonic ringtones.
Enter MP3. Most phones released today have MP3 support. This support not only allows you to listen to your favourite tunes, but it also lets you set your MP3s as ringtones. Furthermore, it’s now extremely easy to get these MP3s onto your phone via your computer, thus it’s very easy to get ringtones on your mobile. No more expensive DCU Nokia cables!
The adoption of such a popular format for ringtones and the ease of file transfer to mobile phones has meant even mobile phone web sites that generated a lot of profit from Google Adsense will suffer from the downturn in ringtone ‘hunting’. This is probably a good thing as a lot of these sites bordered on being MFA (Made For Adsense) sites anyway..