When I was applying for grad school, I felt that my CV was pretty empty and so I included all my research related presentations (posters/talks) from conferences/competitions/etc (11 of them at the time). However, I am not sure how much of a role they played in my acceptance at that time (I feel I mostly got accepted based on my papers and two very strong reference letters).
Now I keep a semi-complete (semi- because of infrequent updates) list of presentations on my website; this is mostly so I can post slides. However, I feel the list has gotten too long for a CV (~25 items; about a full page) and other more important parts of my CV (such as publications) have grown to need that space more.
When should I start omitting or shortening the talks on my CV?
If I include a 'selected' talks section: How many talks should I select? Should I select them based on prestige of venue, or uniform-covering of my interests, or uniform-covering of my time (show that presentations are a regular activity)?
More context: I am at the graduate-student level in my academic progression. A related question: Do presentations given during interviews count as invited talks?