Many travel and holiday websites are now utilizing AJAX to assist in delivering an improved user experience through faster loading, improved page interactivity and enhanced visual presentation. There is also the benefit of reduced bandwidth usage as smaller packets of data are downloaded rather than whole web pages.
There is no doubt that AJAX is here to stay, at least until something better comes along. It’s also likely that the major search engines will become more adept at spidering and indexing AJAX generated content. However, until they do, the simple solution is to avoid using AJAX where it is not needed on your site. If you do intend to use AJAX make sure that your IT department or web developer create real links and HTML content to feed the spiders with.