Can you elaborate on what you mean by highlight text? We have the Inline Comment feature in Confluence where you can select text and then leave a comment on it which results in a highlight on the text. This should be visible to all users that have access to the page. This will only be released with Confluence 5.7: https://confluence.atlassian.com/display/DOC/Confluence+5.7-Beta8+Release+Notes#Confluence5.7-Beta8ReleaseNotes-Simplifyyourteam%27sfeedbackloop
If this functionality is being provided by a third party plugin, then we should probably tag that plugin in this question so the plugin author and users that follow it can also help.
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