My places to get information:
1. Dobber - Read the articles/guides/ and search the forums for specific opinions.
2. HPG (statistically, worth the 20 bucks IMO. Especially if you are in multiple leagues)
3. ESPN Insider/Rumour central. I like it.
4. Hockeys Future
5. My Gut Instinct
In order to win, you gotta take risks sometimes. When making trades... you are going to look back and cringe at some of them... but for every 1 bad trade... there is probably 2-3 good ones.
Shoeless said it best awhile back.
"Did the trade make your team better? If the answer is yes, then you did fine. If it didn't, then you screwed up.
Life is simple in fantasy hockey - it isn't about winning trades, it's about winning leagues"