wiki

Using a wiki as a classroom tool allows collaboration at many levels of ability.
Some of those shown on school websites show excellent depth of both researched knowledge and IT skills to set up the pages with multimedia feeds.
Some geography classes at my school use classroom wikis to investigate Google Earth features.
I will try to set up a classroom wiki to allow collaborative writing with a group of Life Skills students.
Some of the maths pages which encourage reflections on problem-solving have engaged students to communicate a variety of methods.
The use of powerpoint presentations to teach topics and then invite responses looks useful; lots of tools involved on a huge variety of site.

We need to use wikis in staff development to develop staff skills cooperatively and inform staff of possibilities.

Delicious

Use of multiple tags is useful for referencing and collating information on a topic from a variety of viewpoints.
Delicious offers more feedback on usefulness of sites rather than just the site material as referenced by a search engine such as Google.

RSS feed

The use of an RSS aggregator to read updates on regularly visited sites without having to visit such sites individually is potentially very time-saving. I couldn't find any work colleagues using Google Reader to add to my subscriber list, but I did find it useful to get quick updates on professional development topics such as Asperger's syndrome, ADD, etc.
Will have to search further for individual contacts in my areas of professional expertise.
It could be useful to set up a variety of blogs with my Literacy-support-needs class to teach them skills with blogs and RSS feeds and thus motivate them to post and develop their reading/writing/technology skills.

Facebook

I was invited to join Facebook to keep in touch with a young friend who relocated to the US. Since then I've linked to family members in the US and around Australia. The language used very much evidences the generation of the user. The youngsters (under 30s) use SMS speak and tend to embellish (I hope!!) their social & sexual drinking/drugging activities. The older generation are more comfortable with grammatic English, even when using the social links to search for social relationships. I feel like a pedant when I try to bridge ths generation gap to make contact with some young relatives. I haven't used Facebook for collegiate links, but was introduced to Twitter to follow professional development discussions re. literacy theories end English teaching.

MySpace thoughts

MySpace is an incredibly addictive social space with amazing potential to expand people's use of technology resources.
My main contact with Myspace is as a source of sleep-deprivation for mid-to-late-teen girls who are often unable to function capably in the school classroom. We've had issues with cyber-bullying via MySpace, also, and have to be pro-active in teaching face-to-face communication skills and responsibility for actions in utilising MySpace as a social contact tool.
Some barely verbal boys with poor social skills also seem to get hooked on MySpace without developing "real-world relationship" skills. (Links to virtual worlds such as Second Life don't seem to teach these students about connecting to the real world.) We do see some mental Health issues.
My main focus in the school environment is on developing literacy/numeracy and social skills and I mainly have to advise students to limit their time on MySpace and organise a weekly plan to allow for school work and activities away from the computer.

The use of MySpace to connect students to their libraries and community services is brilliant.
Drupal looks to be an amazing service provider; will take some time to investigate it.