Rotoworld:

According to Brad Biggs of the National Football Post, Saints LB Stanley Arnoux is an "ideal fit at weak side."

With WLB Jonathan Casillas placed on injured reserve Saturday, the defending champions need Arnoux to play a predominant role on the defense. If the team chooses to keep Scott Shanle on the strong side, Arnoux and Jo-Lunn Dunbar will compete for playing time on the weak side.

Here's the link to that article: http://www.nationalfootballpost.com/Saints-facing-some-issues-at-linebacker.html
Pat Yakinsas also mentions it to be a possibility: http://espn.go.com/blog/nflnation/tag/_/name/nfl-roster-analysis-2010
I thought Arnoux was hurt during the preseason? Did he even play? I'd much rather have Arnoux at WLB and Shanle at SLB..

Dunbar got some first-team work on the weak side in the early part of camp, but is viewed more as a backup middle linebacker and special-teams player. Arnoux, who missed his rookie season with an injury, has the tools to play the weak side, but lacks experience. This looks like a situation in which the Saints will have to look for help from the outside. What’s available on the waiver wire might not be enough. They might have to pursue a trade for a linebacker with realistic ability to start right away. 

I keep suggesting a trade with the Raiders for Thomas Howard, he's still young and could help us at OLB. Adam Schefter tweeted that he was available yesterday, I wonder what the asking price could be? Adrian Arrington + a pick? Raiders need help at WR, don't they? 

Schefter's Twitter:

Raiders listened to trade offers for LB Thomas Howard and CB Chris Johnson but, at least for time being, opted against trading them

I think the worst move for this team is to move Scott Shanle back to WLB and make Jo-Lonn Dunbar our starting SLB. Dunbar is not a starter in this league, he's a great special teams guy but nothing more then that.. For those of you that are upset with the fact that we took Patrick Robinson at 32 and not Sergio Kindle, well have Kindle even played a snap yet? He's been injured, very injury prone. 

Pay-Loo always find a way to fix it, they acquired Jeremy Shockey pretty close to the beginning of pre-season, if I recall, I wouldn't be surprised to see them acquire a OLB.