 If you liked
Hayate no Gotoku!
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 ...then you might like
Kyouran Kazoku Nikki
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Both are comedy-oriented anime with a large cast of characters with wide exaggerations. They also both have tons of puns referring to anime, game and general japanese pop culture. Kyouran Kazoku is slightly more crazy than Hayate no Gotoku and easier to understand for non-hardcore fan. If you like the comedy style in Hayate no Gotoku, you'll like Kyouran Kazoku Nikki too or vice versa.
Also, the female leads are very similar in character too....