Building/editing topology diagrams - any ideas/advice?

Hi,
I'd like to build a web application that is capable of displaying & editing topology diagram (e.g. a network diagram with applications too). Effectively to have a graphically web based means of allowing a user to add nodes & relationships to represent a topology such as the following [http://performancepointinsider.com/files/planning/planningtopology.png|http://performancepointinsider.com/files/planning/planningtopology.png] . So the model basically consists of nodes and relationships.
Any ideas/advice on how best to do this, e.g.:
Q1. Any open-source project that does something similar?
Q2. Best way of handling the graphical aspect of the application?
(e.g. prototype, extjs, etc?)
Thanks

Hi Eric,
I want to build topology diagrams in Flex 2. Is it possible? Are there any prototypes like TWaver built on Flex 2? Twaver is built on Flex 3 and i cant use it on Flex Builder 2....
P.S: I dont have Flex 3 SDK or Flex Builder 3 and i cant even avail it any time sooner.

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