Search Marketing
Local Search in 2009
Average Query Length
Hitwise reports that 2 word search queries remain the most popular but longer queries are gaining and one-word queries are losing ground compared to last year.

Search Converts Better than Email
According to comScore's February 19, 2009 report on the “State of the US Online Retail Economy," search referrals convert at over 16% compared to 4.4% for email campaigns and 0.8% for visitors coming from a comparison shopping engine.

Average Search Query Length on Ask.com
According to a representative from Ask.com on a panel at SMX West in February 2009, the average query length for searches on Ask.com is 3.89 words per query. 44% of all their queries are 4 words or longer.
Queries of 5 words or more are up 9% since 2008 and queries of more than 8 words have increased 20% since last year.
This demonstrates users are becoming more sophisticated in the way they do searches and it validates the case for buying long tail keywords in SEM campaigns.
If you need help finding long-tail keywords for your ads, check out Google's new Search-based Keyword Tool.