I just completed a assignment to bring a web presence back from the dead. At least it was dead as far as Google was concerned. Moving your website to a new platform like WordPress can kill your page-rank in a heartbeat. The URLs generally change, the content is updated, new pages added, and old pages deleted. It can be a real bummer to learn that no one knows you have a new site.
The long standing myth about developing an effective SEO strategy is in the timing. It's often an afterthought, instead of being included as part of the migration plan. If you're contemplating a site upgrade or full migration, don't forget to include Search Engine Optimization (SEO) as a part of your Internet game plan.
PRACTICAL ECOMMERCE Magazine published a SEO Site Migration Checklist last week with valuable information you can use to prevent the SEO drop associated with a site migration. In my experience, it takes 3 to 6 months to rebuild a site's visibility if SEO is not a considered during a migration. I recommend you share the article link with your web professional. Also check out their article 22 Free Keyword Research Tools.
Here are some other tips for getting ahead of the SEO curve.