What travel games should I buy?

With my upcoming travel, I was thinking about what portable games I should buy. I’ve got a Zune with the latest firmware on it..which will give me Hexic and Texas hold em but what else should I look at? [mn-jumpcontent anchor=’question’]I asked this question on Twitter this morning, but I thought I’d post and ask for your suggestions: What DS, PC or Mac games should I get purchase for my upcoming portable gaming time?[/mn-jumpcontent]