hope noone minds me chipping in with a few thoughts on presentation:)
fact is i believe the presentation should keep the same basic pattern but be adaptable to the situation youre in whilst you dont stray too far from being yourself (if that makes sense :S)... especially being yourself - ever notice how every street magician tries to be the derren type or has a bit of 'da hip-hop stylee' about them (younger ones of course - couldnt imagine paul daniels in baby blue tracky bottoms with a bandana round his head and a slightly dodgy accent). not much variation which is why theres not many 'magic personalities' on tv now... audience attention spans are short and theyve seen it before!
for instance down the pub with the boys is going to be entirely different from entertaining the bridesmaids at a wedding or down the old peoples home. its about what different people respond to and of course expect to see. accentuate your natural behaviour in the situation. and of course mess around with the patter. almost every young magician talks through what theyre doing. try a story (i found 'life, death and other card tricks' a good investment, if only for the inspiration

), and even found a simple routine with a fun story makes a great bedtime story for the kids
but thinking outside the box comes easier too sometimes when you dont try and act. plenty of people do a story or commentate. it can get people excited - or bored when you end up just showing them the effect and their participation ends when they pick a card or you borrow a coin off them!
try making it into a game or conversation to help them relax (not everyone appreciates you shoving your latest trick under their nose and showing off your skill.
and occaisionally like down the boozer a bit of ribbing is good as well as impromptu (REAL impromptu - i.e. not following a phrase like 'hey look at this'). like a spur of the moment coin unique after borrowing 10p off your mate in the pub (yes i like the pub), then... 'oh blimey look gone, howd you do that?!' (always a good line to use to get participation). when people arent expecting magic it can be at its most powerful. no commentary, no fanfare, etc.
these might not be what you spend hours upon hours to do, but they can be great reputataion builders and practice for performing:)