In teaching it has always been good practice to use a variety of resources to make lessons interesting and to cater for different learning styles. Instructional design recommends the use of multiple ways to deliver information and encourage interaction. As the Penn State advice argues the main thing is to be careful that your different modes of delivery don't conflict, so for example, images should relate to the subject text.
With advancing technology and web 2.0, not only are there a whole range of media that can be used by individuals, but storage systems such as eportfolios are also able to upload many different file types.
Recording audio and video is easily done on pocket sized devices, even phones, and files can be converted to compress their size and to be compatible with different storage facilities. There is free software available to do this such as Freemake. For recording evidence for eportfolios the whole range of media can be utilised. You can do audio recordings of your thoughts and idea, or even video all from a home computer. You could record your blogs as audio blogs using something like Ipadio (Phlogs). For capturing extracts of audio you can record on a phone, or using software on the computer. Windows 7 has a very handy snippy tool for quickly capturing screenshots as jpg, gif or png files and so you can capture your forum or blog posts in situ, web pages, PowerPoint slides, wiki pages, or your tutors comments on a piece of work. I used the snipping tool in TMA01 for some of the evidence. Screencasting software could be used to convert PowerPoint presentations or extracts into wmv or mp4 files. Jing is a handy free tool to capture audio and screencasts. For capturing hand written notes and drawings, and newspaper cuttings or other hard copy I use an iphone app called Scan Pages which does just that and saves them as pdf files that you can email to yourself.
I think the key thing is that it's so easy now to do these things that previously required expensive equipment and software and exclusive sharing methods.