下面是几个非常好的介绍搜索引擎的ppt。都是英文内容，但非常不错，下面一些精华内容我稍做翻译。
http://www.ukoln.ac.uk/isg/events/library-2000/search/search.ppt
　

    检索4步曲，此外还介绍了Specialized Search Engines、Tools for seeing the Invisible Web等各种类型的检索工具。
Focus(目的)—What is your mission or question?
Strategize(决策)—Which search tools will you use? Which keywords and search terms will you use and how will you express them?
Evaluate(评价)—Which results will you visit? Which sites or documents are worthy enough to use? Did I do good work?
Refine(重搜)--How might I improve my search results?

http://www.itrainonline.org/itrainonline/mmtk/mmtk_searching.ppt
检索策略，不翻译了，再说也翻译不好，呵呵。
7 Stage Search Strategy:
1. Unpack your query(分开)
2. Phrase your query(解释)
3. Categorise your query(分类)
4. Match a tool to your query(选择引擎)
5. Seek advice from a relevant person(咨询智者)
6. Try again!(重试)
7. Evaluate your results(评价)
http://computing.wlu.edu/services/training/search%20engines.ppt
提到：If two sites use the same engine, you’ll get the same results。
还提到~apple ~pie同义词检索，以前倒没听说过，搜索~password，发现ID/LOGIN/KEY也以粗体字出现了，呵呵。也许是个发现呢。
http://www.lib.flinders.edu.au/info/branch/medical/search.ppt
常见检索引擎的检索特点和用法。
google还是能用截词检索的，即*代替某个字母，中文google也支持的。“？”也能用。不知以前为何不能用？