3-4 point, high approach, one-space low pincer, 3-3 attachment
The attachment at is a common reply to the one space low pincer. Black will usually either cut at a or play hane at b. The immediate jump to c is a new pattern that is still being explored.
Black cuts at and is forced. Next there are the old continuation at a, which can be considered the main line, and a rather new one at b.
Next, Black can atari from above at a, or from below at b, these moves are further explored at 3-4 point, high approach, one-space low pincer, 3-3 attachment, cut and crawl
Against and , is tesuji. An exchange takes place with Black taking corner territory and sente and White influence towards side and center. The result is considered slightly better for White locally but playable for Black in many circumstances.
here is not so good. The marked stone is under little pressure and Black will find it easy to dispose of the situation.
An interesting move (but hamete) that has potential use in some situations
Black trades the corner and some stones to get development on both sides.
This is a well-established line too. Next White plays a (simple), or b, c which are both complex. See 34 Point ,High Approach, One Space Low Pincer, 33-Attachment, Outside Hane, Large Scale Fight.
Recently there have been experiments with , also.
Kogo's joseki dictionary says that this is the modern way, and gives some variations which look rather complicated. Game search have found 121 pro games with this position, mostly played since 1997; a is by far the most common continuation (70/121), but all of b through e appear also. More SL analysis needed, a.o. about White forcing at 'f' then attacking at 'g'.
... itself forces an empty triangle and a connection through , while White fixes her shape. The whole board context then will decide on the timing of living with a, which will tend to be dominated by the fight for stability at the top. Incidentally, b is White's privilege and should be left unplayed to keep the option of connecting underneath at c, adter a has been played.
This variation, where Black connects underneath using , then extends to a, relates to  but is much better for White given the position of the stones. As Antti mentions in his article, White gets a thick position in sente while Black is low.
is a fast play. White has some exciting and very tricky options. d and c are commonly played on Tygem. e: see BQM522.
may be the most standard continuation. a and b both appeared as followups for White to strengthen her group, but it seems a variety of moves are being experimented with.
tapir: MasterGo has a first isolated occurence in 1987 (Ha Chan Soek vs. Yang Su Yeong), and 8 games in 2007 and 20 in 2008 featuring this pattern (2009 games are not yet updated). Results are usually good for White (winning 63%).
becomes overconcentrated when White captures . If at a instead, Black extends across the top to the right to b
Cutting with - is no good. For analysis, see 3-4 point high approach one-space low pincer attachment noseki