In his blog Teaching Science and Math, David Wertzel wrote 5 Alternative Assessment Techniques in Science and Math He keeps it simple and provides excellent suggestions for assessing with and without technology. If you are a math or science teachers, consider following Wertzel's blog.
Here is another example, a Slideshare presentation, Using the Web 2.0 for Alternative Assessment in ELT by Cecilia Lemos.
I believe technology can help teachers provide quality formative and summative assessments and it does not need to be burdensome. Check out these ideas and try something new this month. Keep it simple by beginning with a Web 2.0 tool you and your students are comfortable using. Think about how you can "reframe" a traditional assessment using an online tool.
As always, if you have ideas for using technology for alternative assessments, please share your idea in a comment.