Here you can find literally thousands of speeches that are useful for analysis.

Contemporary speeches

• TED Talks. The home of the famous TED talks, with many great speeches.
• TEDx events. A global catalog of TEDx events, each of them with their own archive of speeches.
• Speakola. Catalog of speeches by genre. Many of them with videos.
• The European Union Speech Repository - A resource geared towards training interpreters, but also a good collection of short speeches on all sorts of subjects.
• British  Political Speech - A resource containing hundreds of speeches by british politicians
• US Supreme Court Oral Arguments - Recordings of all oral arguments heard by the Supreme Court of the US since 2010.

Historical speeches

• The Miller Presidential Speech Archive -  Maintained by the University of Virginia, contains a vast number of historical and current presidential speeches, with transcripts and audio or video recordings where available.
• American Rhetoric. Literally thousands of speeches, including the top 100 speeches of US History, top movie speeches,etc.. Many recordings
• Famous Speeches In History.