there has been a few threads on spokes and brake squeal - search on google for "brake squeal" and "broken spokes" with the switch "site:www.advrider.com" and you should come up with them.
IIRC, the spokes may break when overtightened - its got to be hard to get them balanced right? (I don't true my own wheels... so I have no idea.)
Also, IIRC, someone thought that the brake squeal and the spokes breaking were related - Loaded had a thread on this and it might have been in there. maybe when the spokes are being differentially tightened (untrue?) it puts the brake disc out of allignment with the brake caliper and causes brake squeal. for sure spoke tightening could be involved with spokes breaking.
hope that helps.
someone wanna write up a spoke tensioning/wheel truing guide?