SanDisk was first to market with miniSD in 2003, and is now offers a very broad line of capacities from 128MB through 2.0 GB. SanDisk miniSD is primarily used in mobile phones and can also be used in all SD based devices with the use of the adapter (included).
I own the 02 XDA Mini-s Mobile phone (Brilliant phone) and it requires the SanDisk Mini SD 2GB C/W SD Adapter. Its a 2 GB which is plenty of space for videos and photos and music. I think £7.25 is a amazing price for what you are getting, considering a Ipod nano is a 2 Gb and holds 500 songs of good quality.