For a website with an international target audience, how do I indicate to search engines and others that my website is also geared towards the European market?
- What's the difference between US SEO and worldwide SEO?
Make sure you don't use a country specific TLD like .co.uk or .eu. They tell Google you're targetting a local market. Top level TLDs like .com and .net will tell Google your audience is international in scope. See Google's blog post on working with multiregional websites for more.
If you have multi-lingual content you should follow Google's new multi-lingual guidelines. Basically, you use subdomains for the different translations:
Otherwise the SEO is essentialy the same (quality content, semantic markup, quality links, etc.)