Internet Relay Chat (IRC) started already a long time ago and is one of the first chat programs. Now there are already many chat programs such as Windows Live Messenger, Skype, Yahoo!, AIM, ICQ and Google Chat and that makes IRC unknown. With the IRC-client you can connect to different ICR-servers which are available on the internet and once connected you can chat with other users on the IRC-server.
Spotify is a popular music service on the Internet, especially in Europe. Unlike other music services Spotify is totally legal. Originally Spotify is a Swedish company and has licensing agreements with various music companies and record labels such as Sony, EMI, Warner and Universal. The revenues are generated by broadcasting commercials. If you pay $10 a month, you have some extra features such as stop the advertising and listening to your playlists without an Internet connection.
Finally Google comes with the in the cloud service Drive. With Google Drive you get a 5 Gb free online storage which you can use together with Google Docs. For $2.50 per month you can expand up to 25 GB. Google Drive is actually Google Docs and has the possibility to work together online on documents and store them online. The same as Microsoft Skydrive you can synchronize you computer with other devices. Microsoft recently renewed Skydrive but Google had no alternative.
Skydrive is an in the cloud service with a storage space of 25 GB, but Microsoft has announced that Skydrive will reduce storage space back to 7 GB. Still it is possible to increase your account up to 25 GB.
Dropbox is a free program that allows to share photos, videos and documents between different computers. The Dropbox folder contains your files which will be synchronized between multiple computers, and the files you customized in the office are also visible on the computer at home.
The most effective and common way to store your work is using your own computer, but those files and programs are only available on the computer you stored them.
With Google Docs you can work on documents online and share them in different ways with other people. Those people do not always need a Google account.
Adobe has an online service Acrobat.com for people who works a lot with PDF files. This service makes it possible to create PDF files and also other types of files to upload and then share them with other users or embed to your website or blog.
If you want to offer your website visitors PDF documents, they need to download this first or viewing it in the browser using Adobe Reader.