In my opinion, munchies served at a wine tasting should be content to play a supporting role to the wines, not trying to elbow their way to the podium. This is probably not the place for your Ring of Death garlic habanero meatballs. I tend to prefer simpler fare in such situations, like fresh grapes, melon cubes, strips of raw bell pepper and an assortment of not too overpowering cheeses. Then again, a blob of roquefort on a good cracker, washed down by some assertive big red can be quite an experience.
Cold cuts are nice. Forget the proscuitto, even though it is quite tasty. See if your Italian deli has speck, which is similar but not quite. Or perhaps you have a German oriented place handy, and can get some good Westphalian ham. A good chicken liver pate to spread on some of the crackers and breads you'll be serving is nice, as well as some herbed butters. Perhaps a little medallion of rare roast beef on a chunk of toasted bread, topped with a wave of mustard or mayo and a caper or two. Smoked fish, like salmon or chub. Grilled or roasted white asparagus spears with hollandaise. If you've got the time, a batch of parmesan crisps. Stuffed mushrooms. Grilled garlic - lemon shrimp. Candied pecans and blue cheese crumbles in endive leaves.
You want the food to be a pleasant interlude to the wines, you don't want your guests to be chugging it down trying to rinse out the taste of Aunt Matilda's anchovy- brussels sprout creampuffs. Keep pitchers of ice water with lemon at hand for that task.
I'm just rambling off some quick ideas, nothing cuttng edge, some old standbys, but perhaps something will be of some use to you, inspire something appropriate.
mjb.