:first

This will find the first selected element. The following code finds the first row in a table of 5 rows.

                   $("tr:first")

:last

Matches the last selected element.

:not(selector)

Filters out all elements matching the given selector. This will select all the elements which doesn't match the given selector. Consider the following example :

                   $("input:not(:checked))

This code will match all the check boxes which are not checked.

:even

Finds all the even elements. The following example find all the even rows i.e. 0^Th, 2^nd, 4^th, 6^th and so on.

                   $("tr:even")

:odd

Matches all the odd elements

                        $("tr:odd")

:eq(index)

Finds a single element by its index. The following example finds the 3^rd TD in a set of Tds.

                   $("td:eq(3)")

:gt(index)

Finds all the elements which have index more than the given index. The following example finds all the Tds with index greater than 2.

                   $("td:gt(2)")

In a set of 6 TDs only 3^rd, 4^th, 5^th, 6^th TDs will be selected.

:lt(index)

Finds all the elements which have index less than the given index.

:header

Matches all Header elements like h1, h2, h3 and so on.

                        $(":header")

:animated

Matches all elements that are currently being animated.

                        $("div:animated")

Suppose there are 3 DIVs out of which one is being animated. Then the above code will select the currently animated DIV.