Filter out nodes with the same title in views
Consider looking at the Views Distinct module to do this ... Here are some details about this module (from its project page):

Relationships or other joins in Views often create &quot;duplicate&quot; results. For example, a node with a field that has multiple values may show up in the View once per value in the multi-value field. It's frustrating, and the &quot;DISTINCT&quot; SQL query option in the Views UI does not actually solve the problem because the result row is technically distinct. This module aims to give a simple GUI method to remove or aggregate these &quot;duplicate&quot; rows.
For any given field, including &quot;Global: Text&quot; fields, you can optionally mark the field as filtered (&quot;Filter Repeats&quot;) or aggregated (&quot;Aggregate Repeats&quot;). All rows with the same value in that field will either be removed as duplicates (filtered), or aggregated in-line.
The &quot;value&quot; of the field as used for filtering or aggregation can be taken pre-render (fastest and totally cacheable), or post-render (after any rewrite rules or other transformations have occurred). Post-render actions are a bit slower (the View must be re-rendered, though the query is not re-run), but also work with Global fields, like Global: Text w/rewrite rules.

If this doesn't work for you, or for some reason you cannot / do not want to use this module, then consider any of the alteratives suggested by Sumit Madan ... (+1 !).