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LisaB
Things we've done that have helped:
(1) creative use of htaccess and robots.txt to re-direct spiders and make sure things get indexed quickly
(2) maintenance of existing pages with a re-direct on them to the new parallel pages (helps you keep from losing people who bookmarked your site)
(3) vigorous re-registration of the site
Another nightmare arises when you have a significant number of inbound links: Hit that email! Get people to update ASAP.
Hope this helps...
rico!
We changed from html to .asp recently and redesigned the whole site in to the bargain. We dropped from ranking 7th for our 2 main KW's down to as low as around 25 for about 3 weeks. Interestingly, our old site really wasnt SEO'd at all, but had just developed over time. The new site was SEO'd from start to finish.
We've just returned to the front page at around 10th position (I still think 10th is better than 4th to 9th though so I'm happy with that).
The only thing we tried to do (or could do under the circumstances) was keep as much of the visible text the same as possible.