Man, I had some guy in my guild begging for Albrecht Tank Armor. He was like a 140+ Trader. So, I bust my ass and manage to get him a 197 and then find out he's wearing full Carbonum underneath it. Sheesh!
But, seriously. =) I always take time to drop buffs on anyone who's asking for credits. Having a high level MP, I'm sure that dropping 'Teachings of MC/TS' on an 18 Engineer is worth a fair amounts of credits to the hard working noobs out there.
Other occasions, if I get begged while dumping loot after a mission, I'll find something that would sell for the approximate level of credits they beg for and give it to them to sell. Half the time they're annoyed that they actually have to go to a shop and sell it.
Finally, I do always help Neutral faction mates with credits, advice, items they can use for the future. Usually it's the advice that comes first and then the rest follows if there's any sincerity in the conversation. I try to avoid financing Twinks as I know how utterly easy that is considering I got 6 characters with Yalms and full nano crystal sets waiting in their banks. Used to be easy to slip in a question like 'have you seen the big pyramid, yet?' and get them to fumble and say 'oh, yeah the one in BS' to blow their covers.
When it comes to beggars we all have to realize that while we often do them no favors to finance them for 30 levels, it's also possible that by getting a little guy 'over the hump' we may be preventing a good guy from leaving the game due to frustration. Then again, if we let 'em leave, we may be doing them a favor in the long run.