Your index page’s title is used for the title for your site when it appears in search results. It is important to pack the relevant keywords you are optimising for into it. The length to aim for is around 65 charaters for your title to be displayed fully in google’s SERP(Search Engine Results Page), the precise length seems to vary depending apon the number of characters that overlap the boundary.

For mine I came up with this at 63 characters:

joredwood.co.uk - Blog and Portfolio for Jo Redwood

Try to be descriptive, only use keywords in context and try to make it visually appealing.

And not:

>>>>>CLICK HERE<<<<< LOOK @ MY WEBSITE!!!!!!!!!!!